diff --git a/apps/desktop/src/gui/application/gui_application.cpp b/apps/desktop/src/gui/application/gui_application.cpp
index bb34e63d..5fb66c07 100644
--- a/apps/desktop/src/gui/application/gui_application.cpp
+++ b/apps/desktop/src/gui/application/gui_application.cpp
@@ -859,6 +859,9 @@ struct GuiApplication::SlintUi {
   std::string gallery_focus, gallery_auth_id, gallery_requested_auth,
       gallery_control_id;
   std::chrono::steady_clock::time_point gallery_synced{};
+  std::chrono::steady_clock::time_point gallery_network_synced{};
+  std::shared_ptr<slint::VectorModel<ui::GalleryNetworkDevice>> gallery_network_model =
+      std::make_shared<slint::VectorModel<ui::GalleryNetworkDevice>>();
   gallery::WindowState gallery_window;
   gallery::FullscreenTransition gallery_transition;
   int main_restore_ticks = 0;
@@ -1162,6 +1165,7 @@ void GuiApplication::InitializeUi() {
     LOG_WARN("Could not load DeskHub workspace; original file retained");
   ui_->main->set_gallery_tiles(ui_->gallery_model);
   ui_->main->set_gallery_selected_devices(ui_->gallery_selected_model);
+  ui_->main->set_gallery_network_devices(ui_->gallery_network_model);
   // Always start on Connection; saved wall geometry is restored only when
   // the user switches to DeskHub, regardless of the previous launch's mode.
   ui_->main->set_gallery_mode(false);
@@ -1313,6 +1317,11 @@ void GuiApplication::ResetSettingsUi() {
   ui_->main->set_server_host(signal_server_ip_self_);
   ui_->main->set_server_port(signal_server_port_self_);
   ui_->main->set_self_host_settings_error("");
+  ui_->main->set_gallery_resolution_index(ui_->gallery.stream_settings.resolution);
+  ui_->main->set_gallery_frame_rate_index(ui_->gallery.stream_settings.FrameRateIndex());
+  ui_->main->set_gallery_resolution_draft(ui_->gallery.stream_settings.resolution);
+  ui_->main->set_gallery_frame_rate_draft(ui_->gallery.stream_settings.FrameRateIndex());
+  ui_->main->set_gallery_settings_error("");
 }
 
 void GuiApplication::BindMainCallbacks() {
@@ -1792,14 +1801,11 @@ void GuiApplication::BindStreamCallbacks() {
     if (!props || !props->connection_established_) {
       return;
     }
-    props->audio_capture_button_pressed_ =
-        !props->audio_capture_button_pressed_;
-    RemoteAction action{};
-    action.type = ControlType::audio_capture;
-    action.a = props->audio_capture_button_pressed_;
-    const std::string message = action.to_json();
-    SendReliableDataFrame(props->peer_, message.c_str(), message.size(),
-                          props->control_data_label_.c_str());
+    if (props->audio_capture_button_pressed_)
+      MuteRemoteAudio(props);
+    else
+      UnmuteRemoteAudio(props);
+    SyncAudioPlayback();
   });
   stream->on_select_file([this] {
     auto props = SelectedSession();
@@ -3710,14 +3716,35 @@ bool GuiApplication::SaveSettingsFromUi() {
       !std::string(main->get_server_host()).empty() ||
       !std::string(main->get_server_port()).empty();
   if (has_endpoint && !ValidateSelfHostedSettingsFromUi()) {
+    main->set_settings_tab(0);
     main->set_self_host_settings_open(true);
     return false;
   }
+  const auto wall_settings = gallery::StreamSettings::FromIndices(
+      main->get_gallery_resolution_draft(), main->get_gallery_frame_rate_draft());
+  const bool wall_changed = wall_settings &&
+      (wall_settings->resolution != ui_->gallery.stream_settings.resolution ||
+       wall_settings->frame_rate != ui_->gallery.stream_settings.frame_rate);
+  auto updated_wall = ui_->gallery;
+  if (wall_settings) updated_wall.stream_settings = *wall_settings;
+  // Persist the draft first, but leave live sessions unchanged until the
+  // common save succeeds. Restore the previous wall file if it fails.
+  if (!wall_settings || (wall_changed && !updated_wall.Save(ui_->gallery_path))) {
+    main->set_gallery_settings_error(UiText(
+        localization_language_index_ == 0 ? "保存失败，请重试"
+        : localization_language_index_ == 2 ? "Не удалось сохранить"
+                                            : "Could not save; try again"));
+    main->set_settings_tab(1);
+    return false;
+  }
   if ((has_endpoint && config_center_->SetServerEndpoint(
           std::string(main->get_server_host()), *ParsePort(main->get_server_port())) != 0) ||
       config_center_->SetSelfHosted(main->get_self_hosted_enabled()) != 0) {
+    if (wall_changed && !ui_->gallery.Save(ui_->gallery_path))
+      LOG_ERROR("Failed to restore DeskHub settings after common save failure");
     main->set_self_host_settings_error(UiText(
         localization::self_hosted_save_failed[localization_language_index_]));
+    main->set_settings_tab(0);
     main->set_self_host_settings_open(true);
     return false;
   }
@@ -3786,6 +3813,14 @@ bool GuiApplication::SaveSettingsFromUi() {
                sizeof(file_transfer_save_path_buf_) - 1);
   config_center_->SetFileTransferSavePath(path);
 
+  if (wall_changed) {
+    ui_->gallery.stream_settings = *wall_settings;
+    std::shared_lock lock(remote_sessions_mutex_);
+    for (const auto& [_, props] : remote_sessions_)
+      if (props && !props->closing_ && props->wall_managed_)
+        props->preview_needs_sync_ = true;
+    ui_->gallery_synced = {};
+  }
   ApplySettingsFromConfig(previous_server !=
                           GetSignalServerSettings(*config_center_));
   return true;
@@ -3912,9 +3947,6 @@ void GuiApplication::SelectStreamTab(int index) {
         props->clipboard_allowed_ = props->tab_selected_ &&
                                     props->control_mouse_ &&
                                     focus_on_stream_window_;
-        props->audio_allowed_ =
-            (props->tab_selected_ && props->audio_capture_button_pressed_ &&
-             focus_on_stream_window_);
       }
     }
     const auto selected = remote_sessions_.find(selected_remote_id);
@@ -3926,6 +3958,7 @@ void GuiApplication::SelectStreamTab(int index) {
                                selected_session->connection_status_.load() ==
                                    ConnectionStatus::Connected;
   }
+  SyncAudioPlayback();
 }
 
 void GuiApplication::ReorderStreamTab(int from, float drop_x, float tab_width) {
@@ -4188,6 +4221,26 @@ bool GuiApplication::OpenUrl(const std::string& url) {
   return SDL_OpenURL(url.c_str());
 }
 
+void GuiApplication::SyncAudioPlayback() {
+  const bool wall_visible = ui_ && ui_->main->get_gallery_mode() &&
+      ui_->main->window().is_visible() && !ui_->main->window().is_minimized();
+  const bool stream_active = ui_ && ui_->stream && focus_on_stream_window_ &&
+      (*ui_->stream)->window().is_visible() &&
+      !(*ui_->stream)->window().is_minimized();
+  std::lock_guard delivery_lock(audio_delivery_mutex_);
+  std::shared_lock lock(remote_sessions_mutex_);
+  for (const auto& [id, props] : remote_sessions_) {
+    const bool allowed = !props->closing_ &&
+        props->connection_status_ == ConnectionStatus::Connected &&
+        props->audio_capture_button_pressed_ &&
+        ((wall_visible && props->wall_managed_) ||
+         (stream_active && props->tab_opened_ && props->tab_selected_));
+    if (props->audio_allowed_.exchange(allowed) != allowed)
+      props->preview_needs_sync_ = true;
+    if (!allowed) devices_.ClearAudio(id);
+  }
+}
+
 void GuiApplication::ReleaseControl() {
   const auto gallery_target = ui_->gallery_control_id;
   devices_.StopKeyboardCapturer();
@@ -4212,17 +4265,14 @@ void GuiApplication::ReleaseControl() {
     ui_->main->set_gallery_controlling(false);
   }
   ui_->pressed_mouse_buttons.clear();
-  std::lock_guard delivery_lock(audio_delivery_mutex_);
-  devices_.ClearAudio();
+  SyncAudioPlayback();
   std::shared_lock lock(remote_sessions_mutex_);
   for (const auto& [id, props] : remote_sessions_) {
     ++props->input_generation_;
     props->clipboard_allowed_ = false;
-    props->audio_allowed_ = false;
     if (id == gallery_target) {
       props->control_mouse_ = false;
       props->enable_mouse_control_ = false;
-      props->audio_capture_button_pressed_ = false;
     }
   }
   controlled_remote_id_.clear();
@@ -4235,6 +4285,17 @@ void GuiApplication::ChangeMainMode(bool wall) {
   ui_->main->set_gallery_transitioning(false);
   ui_->main->set_gallery_content_visible(true);
   ReleaseControl();
+  if (wall) {
+    std::vector<std::shared_ptr<RemoteSession>> sessions;
+    {
+      std::shared_lock lock(remote_sessions_mutex_);
+      for (const auto& [_, props] : remote_sessions_)
+        if (props && !props->closing_) sessions.push_back(props);
+    }
+    // Apply the wall's default to existing connections as well as new ones.
+    // Do this once on entry, so an explicit unmute can still take effect.
+    for (const auto& props : sessions) MuteRemoteAudio(props);
+  }
   auto& window = ui_->main->window();
 #if defined(__APPLE__)
   const bool fullscreen = IsMainWindowFullscreen();
@@ -4361,7 +4422,10 @@ bool GuiApplication::AddGalleryDevice(const std::string& input,
                  "Не удалось сохранить");
   ui_->gallery = std::move(updated);
   ui_->gallery_hidden_active_ids.erase(id);
-  if (auto props = FindRemoteSession(id)) props->wall_managed_ = true;
+  if (auto props = FindRemoteSession(id)) {
+    props->wall_managed_ = true;
+    MuteRemoteAudio(props);
+  }
   for (auto& operation : ui_->batch_operations)
     if (operation.id == id && operation.action == "connect" &&
         operation.state == State::AwaitingPassword)
@@ -4405,7 +4469,10 @@ bool GuiApplication::ImportGalleryRecent(const std::string& input_group) {
   // store and are looked up by the normal connect action when requested.
   for (const auto& id : ids) {
     ui_->gallery_hidden_active_ids.erase(id);
-    if (auto props = FindRemoteSession(id)) props->wall_managed_ = true;
+    if (auto props = FindRemoteSession(id)) {
+      props->wall_managed_ = true;
+      MuteRemoteAudio(props);
+    }
   }
   ui_->gallery_focus.clear();
   ui_->gallery.selected.clear();
@@ -4497,6 +4564,16 @@ void GuiApplication::GalleryAction(const std::string& action,
   using OperationState = SlintUi::BatchOperation::State;
   auto& wall = ui_->gallery;
   ui_->gallery_synced = {};
+  if (action == "settings-open") {
+    ReleaseControl();
+    ui_->main->set_gallery_settings_error("");
+    return;
+  }
+  if (action == "network-open") {
+    ReleaseControl();
+    ui_->gallery_network_synced = {};
+    return;
+  }
   const auto tr = [this](const char* zh, const char* en, const char* ru) {
     return UiText(localization_language_index_ == 0   ? zh
                   : localization_language_index_ == 2 ? ru
@@ -4556,7 +4633,7 @@ void GuiApplication::GalleryAction(const std::string& action,
     wall.page = 0;
     wall.selected.clear();
     ui_->gallery_focus.clear();
-  } else if (action == "selection") {
+  } else if (action == "selection" || action == "view-mode") {
     ReleaseControl();
     wall.selected.clear();
     ui_->gallery_focus.clear();
@@ -4616,7 +4693,8 @@ void GuiApplication::GalleryAction(const std::string& action,
     }
   } else if (action == "release") {
     ReleaseControl();
-  } else if (action == "connect" || action == "disconnect" || action == "file") {
+  } else if (action == "connect" || action == "disconnect" || action == "mute" ||
+             action == "unmute" || action == "file") {
     std::vector<std::string> ids;
     if (!value.empty())
       ids.push_back(value);
@@ -4624,6 +4702,21 @@ void GuiApplication::GalleryAction(const std::string& action,
       for (const auto& id : ui_->gallery_ids)
         if (wall.selected.count(id)) ids.push_back(id);
     if (ids.empty()) return;
+    if (action == "mute" || action == "unmute") {
+      for (const auto& id : ids) {
+        if (auto props = FindRemoteSession(id);
+            props && !props->closing_ &&
+            props->connection_status_ == ConnectionStatus::Connected) {
+          if (action == "mute") {
+            MuteRemoteAudio(props);
+          } else {
+            UnmuteRemoteAudio(props);
+          }
+        }
+      }
+      SyncGallery();
+      return;
+    }
     if (action == "connect" && !value.empty())
       ui_->gallery_requested_auth = value;
     ReleaseControl();
@@ -4776,6 +4869,7 @@ void GuiApplication::RestoreMainWindowGeometry(bool before_show) {
 void GuiApplication::SyncGallery() {
   using OperationState = SlintUi::BatchOperation::State;
   if (!ui_) return;
+  SyncAudioPlayback();
   auto& window = ui_->main->window();
   const auto current_size = window.size();
   if (ui_->observed_main_size &&
@@ -4901,6 +4995,71 @@ void GuiApplication::SyncGallery() {
     }
     return settings_.RecentConnectionDisplayName(device);
   };
+  if (visible && ui_->main->get_gallery_network_open() &&
+      now - ui_->gallery_network_synced >= 1s) {
+    ui_->gallery_network_synced = now;
+    // This list follows live connections, independently of the wall's current
+    // group and page. Never show saved, queued or still-connecting devices.
+    std::vector<std::string> connected_ids;
+    {
+      std::shared_lock lock(remote_sessions_mutex_);
+      for (const auto& [id, props] : remote_sessions_)
+        if (props && !props->closing_ &&
+            props->connection_status_ == ConnectionStatus::Connected)
+          connected_ids.push_back(id);
+    }
+    std::sort(connected_ids.begin(), connected_ids.end());
+    std::vector<ui::GalleryNetworkDevice> devices;
+    for (const auto& id : connected_ids) {
+      const auto props = FindRemoteSession(id);
+      if (!props || props->closing_ ||
+          props->connection_status_ != ConnectionStatus::Connected)
+        continue;
+      ui::GalleryNetworkDevice device{};
+      device.name = UiText(name(id));
+      device.id = UiText(FormatPeerId(id.c_str()));
+      const auto mode = props->traversal_mode_.load();
+      device.mode = UiText(mode == TraversalMode::P2P
+          ? tr("直连", "Direct", "Напрямую")
+          : mode == TraversalMode::UnknownMode
+              ? tr("等待统计", "Awaiting stats", "Ждём данные")
+              : tr("中继", "Relay", "Ретрансляция"));
+      device.latency = device.inbound = device.outbound = device.loss = "—";
+      const auto video = props->received_video_stats_.Get(now);
+      device.resolution = video.width > 0 && video.height > 0
+          ? UiText(std::to_string(video.width) + " × " + std::to_string(video.height))
+          : UiText("—");
+      device.fps = video.fps ? UiText(std::to_string(*video.fps) + " FPS") : UiText("—");
+      const bool has_report = props->net_traffic_stats_.HasRecentReport(now);
+      const auto stats = props->net_traffic_stats_.Load();
+      // Use negotiated transport state, never the local encryption preference.
+      // Missing/stale reports cannot confirm either encrypted or plaintext.
+      device.encryption_known = has_report;
+      device.encryption_enabled = has_report && stats.srtp_active;
+      if (mode != TraversalMode::UnknownMode && has_report) {
+        device.inbound = UiText(FormatBitrate(stats.total_inbound_stats.bitrate));
+        device.outbound = UiText(FormatBitrate(stats.total_outbound_stats.bitrate));
+        if (const auto rtt = props->net_traffic_stats_.SmoothedRttMs(now))
+          device.latency = UiText(*rtt < 1 ? "<1 ms"
+              : std::to_string(static_cast<int>(std::lround(*rtt))) + " ms");
+        // MiniRTC's total loss is a sum of media fractions, not an aggregate.
+        // Report video loss explicitly, and only after receiving video packets.
+        if (stats.video_inbound_stats.rtp_packet_count > 0 &&
+            std::isfinite(stats.video_inbound_stats.loss_rate)) {
+          char loss[24];
+          std::snprintf(loss, sizeof(loss), "%.1f%%",
+              std::clamp(stats.video_inbound_stats.loss_rate, 0.0f, 1.0f) * 100.0f);
+          device.loss = UiText(loss);
+        }
+      }
+      devices.push_back(std::move(device));
+    }
+    if (ui_->gallery_network_model->row_count() != devices.size())
+      ui_->gallery_network_model->set_vector(std::move(devices));
+    else
+      for (size_t i = 0; i < devices.size(); ++i)
+        ui_->gallery_network_model->set_row_data(i, devices[i]);
+  }
   // Limit simultaneous operations without keeping a user-facing operation list
   // or operation history. Targets stay fixed when the selection changes.
   int running = std::count_if(
@@ -4916,6 +5075,11 @@ void GuiApplication::SyncGallery() {
       ++running;
       auto props = FindRemoteSession(operation.id);
       if (operation.action == "connect") {
+        if (props && !props->closing_) {
+          // A wall connect can reuse an already connected/connecting peer.
+          props->wall_managed_ = true;
+          MuteRemoteAudio(props);
+        }
         const auto status = props ? props->connection_status_.load()
                                   : ConnectionStatus::Closed;
         const bool usable = props && props->peer_ && !props->closing_;
@@ -5069,6 +5233,11 @@ void GuiApplication::SyncGallery() {
       std::max(1, (int(ids.size()) + wall.capacity - 1) / wall.capacity));
   ui_->main->set_gallery_count(ids.size());
   int connected = 0, selected_on_page = 0;
+  const auto gallery_viewport = visible && !ui_->gallery_focus.empty()
+      ? gallery::PreviewResolution::Viewport(
+            ui_->main->get_gallery_video_width(),
+            ui_->main->get_gallery_video_height(), window.scale_factor())
+      : gallery::PreviewResolution{};
   std::set<std::string> preview_ids;
   std::vector<ui::GalleryTile> tiles;
   const auto make_tile = [&](const std::string& id, bool preview) {
@@ -5102,7 +5271,9 @@ void GuiApplication::SyncGallery() {
           props->connection_status_.load(), localization_language_index_));
     if (preview && visible && tile.connected) {
       preview_ids.insert(id);
-      props->gallery_preview_width_ = ui_->gallery_focus == id ? 960 : 320;
+      props->gallery_preview_width_ = ui_->gallery_focus == id
+          ? std::max({320, gallery_viewport.width, gallery_viewport.height})
+          : 320;
       std::lock_guard lock(props->gallery_frame_mutex_);
       if (props->gallery_rgba_) {
         auto& cached = ui_->gallery_previews[id];
@@ -5153,6 +5324,7 @@ void GuiApplication::SyncGallery() {
   ui_->main->set_gallery_hidden_selected(wall.selected.size() -
                                          selected_on_page);
   std::vector<ui::GalleryActionDevice> selected_devices;
+  bool selected_audio_available = false, selected_audio_muted = true;
   for (const auto& id : ids)
     if (wall.selected.count(id)) {
       ui::GalleryActionDevice device{};
@@ -5161,8 +5333,15 @@ void GuiApplication::SyncGallery() {
       const auto props = FindRemoteSession(id);
       device.connected = props && !props->closing_ &&
                          props->connection_status_ == ConnectionStatus::Connected;
+      if (device.connected) {
+        selected_audio_available = true;
+        selected_audio_muted &= !props->audio_capture_button_pressed_;
+      }
       selected_devices.push_back(std::move(device));
     }
+  ui_->main->set_gallery_selected_audio_available(selected_audio_available);
+  ui_->main->set_gallery_selected_audio_muted(selected_audio_available &&
+                                             selected_audio_muted);
   if (ui_->gallery_selected_model->row_count() != selected_devices.size())
     ui_->gallery_selected_model->set_vector(std::move(selected_devices));
   else
@@ -5190,8 +5369,10 @@ void GuiApplication::SyncGallery() {
       }
       if (props->preview_subscription_supported_ &&
           props->connection_status_ == ConnectionStatus::Connected) {
-        // Every connected device retains its interactive video settings,
-        // including devices on other pages or behind a hidden wall window.
+        if (wall_mode && !ui_->gallery_hidden_active_ids.count(id))
+          props->wall_managed_ = true;
+        // Keep session quality and audio; wall settings override only the
+        // requested resolution/cadence and never overwrite session preferences.
         PreviewSubscription demand;
         {
           std::lock_guard settings_lock(props->video_settings_mutex_);
@@ -5199,12 +5380,35 @@ void GuiApplication::SyncGallery() {
               props->video_settings_.quality, props->video_settings_.frame_rate,
               props->video_settings_.preference, props->audio_allowed_.load());
         }
+        if (props->wall_managed_)
+          wall.stream_settings.ApplyFrameRate(demand, props->preview_fps15_supported_);
+        const bool needs_sync = props->preview_needs_sync_.exchange(false);
+        if (props->preview_resolution_supported_) {
+          gallery::PreviewResolution stream_viewport;
+          if (props->tab_opened_ && id == focused_remote_id_ && ui_->stream &&
+              (*ui_->stream)->window().is_visible() &&
+              !(*ui_->stream)->window().is_minimized()) {
+            stream_viewport = gallery::PreviewResolution::Viewport(
+                (*ui_->stream)->get_video_area_width(),
+                (*ui_->stream)->get_video_area_height(),
+                (*ui_->stream)->window().scale_factor());
+          }
+          const auto resolution = props->preview_resolution_.Update(
+              wall.stream_settings.Resolution(
+                  props->wall_managed_, ui_->gallery_focus == id
+                      ? gallery_viewport : gallery::PreviewResolution{},
+                  stream_viewport), now, needs_sync);
+          demand.version = 2;
+          demand.width = resolution.width;
+          demand.height = resolution.height;
+        }
         const bool acknowledged =
             props->preview_ack_.load() == props->preview_request_ &&
             props->preview_accepted_.load();
-        if (!demand.SameSettings(props->preview_requested_) ||
+        if (needs_sync || !demand.SameSettings(props->preview_requested_) ||
             (!acknowledged && now - props->preview_request_at_ > 5s)) {
           demand.request_id = ++props->preview_request_;
+          if (!demand.request_id) demand.request_id = ++props->preview_request_;
           const auto message = demand.ToJson().dump();
           if (SendReliableDataFrame(props->peer_, message.data(),
                                     message.size(),
diff --git a/apps/desktop/src/gui/application/gui_application.h b/apps/desktop/src/gui/application/gui_application.h
index fe4ff2c2..f6bc9e40 100644
--- a/apps/desktop/src/gui/application/gui_application.h
+++ b/apps/desktop/src/gui/application/gui_application.h
@@ -71,6 +71,7 @@ private:
   void DeviceGroupAction(const std::string& action, const std::string& value);
   bool SaveDeviceGroups(const std::string& new_group);
   void ReleaseControl();
+  void SyncAudioPlayback();
   void SaveGalleryWindowState();
   void SyncAnnouncements();
   void SyncConnectionDialog();
diff --git a/apps/desktop/src/gui/features/devices/session_device_manager.cpp b/apps/desktop/src/gui/features/devices/session_device_manager.cpp
index 564548ca..98b8e1b4 100644
--- a/apps/desktop/src/gui/features/devices/session_device_manager.cpp
+++ b/apps/desktop/src/gui/features/devices/session_device_manager.cpp
@@ -540,13 +540,13 @@ int SessionDeviceManager::InitializeAudioOutput() {
   desired_out.format = SDL_AUDIO_S16;
   desired_out.channels = 1;
 
-  auto open_stream = [&]() {
-    output_stream_ = SDL_OpenAudioDeviceStream(
-        SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, &desired_out, nullptr, nullptr);
-    return output_stream_ != nullptr;
+  auto open_device = [&]() {
+    output_device_ = SDL_OpenAudioDevice(
+        SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, &desired_out);
+    return output_device_ != 0;
   };
 
-  if (!open_stream()) {
+  if (!open_device()) {
 #if defined(__linux__) && !defined(__APPLE__)
     LOG_WARN("Failed to open output stream with driver [{}]: {}",
              getenv("SDL_AUDIODRIVER") ? getenv("SDL_AUDIODRIVER")
@@ -560,7 +560,7 @@ int SessionDeviceManager::InitializeAudioOutput() {
                 SDL_GetError());
       return -1;
     }
-    if (!open_stream()) {
+    if (!open_device()) {
       LOG_ERROR("Failed to open output stream with dummy driver: {}",
                 SDL_GetError());
       return -1;
@@ -572,31 +572,50 @@ int SessionDeviceManager::InitializeAudioOutput() {
 #endif
   }
 
-  SDL_ResumeAudioDevice(SDL_GetAudioStreamDevice(output_stream_));
+  SDL_ResumeAudioDevice(output_device_);
   return 0;
 }
 
 int SessionDeviceManager::DestroyAudioOutput() {
-  if (output_stream_) {
-    SDL_CloseAudioDevice(SDL_GetAudioStreamDevice(output_stream_));
-    SDL_DestroyAudioStream(output_stream_);
-    output_stream_ = nullptr;
+  for (const auto& [_, stream] : output_streams_)
+    SDL_DestroyAudioStream(stream);
+  output_streams_.clear();
+  if (output_device_) {
+    SDL_CloseAudioDevice(output_device_);
+    output_device_ = 0;
   }
   return 0;
 }
 
-void SessionDeviceManager::ClearAudio() {
-  if (output_stream_) SDL_ClearAudioStream(output_stream_);
+void SessionDeviceManager::ClearAudio(const std::string& remote_id) {
+  const auto found = output_streams_.find(remote_id);
+  if (found == output_streams_.end()) return;
+  SDL_DestroyAudioStream(found->second);
+  output_streams_.erase(found);
 }
 
-void SessionDeviceManager::PushAudio(const char *data, size_t size) {
-  if (!output_stream_) {
-    return;
+void SessionDeviceManager::PushAudio(const std::string& remote_id,
+                                     const char *data, size_t size) {
+  if (!output_device_) return;
+  auto found = output_streams_.find(remote_id);
+  if (found == output_streams_.end()) {
+    SDL_AudioSpec spec{};
+    spec.freq = 48000;
+    spec.format = SDL_AUDIO_S16;
+    spec.channels = 1;
+    auto* stream = SDL_CreateAudioStream(&spec, &spec);
+    if (!stream) {
+      LOG_ERROR("Failed to create output stream: {}", SDL_GetError());
+      return;
+    }
+    if (!SDL_BindAudioStream(output_device_, stream)) {
+      LOG_ERROR("Failed to bind output stream: {}", SDL_GetError());
+      SDL_DestroyAudioStream(stream);
+      return;
+    }
+    found = output_streams_.emplace(remote_id, stream).first;
   }
-  const int pushed = SDL_PutAudioStreamData(
-      output_stream_, reinterpret_cast<const Uint8 *>(data),
-      static_cast<int>(size));
-  if (pushed < 0) {
+  if (!SDL_PutAudioStreamData(found->second, data, static_cast<int>(size))) {
     LOG_ERROR("Failed to push audio data: {}", SDL_GetError());
   }
 }
diff --git a/apps/desktop/src/gui/features/devices/session_device_manager.h b/apps/desktop/src/gui/features/devices/session_device_manager.h
index 34d1e4ad..da7caf76 100644
--- a/apps/desktop/src/gui/features/devices/session_device_manager.h
+++ b/apps/desktop/src/gui/features/devices/session_device_manager.h
@@ -13,6 +13,7 @@
 #include <cstdint>
 #include <mutex>
 #include <string>
+#include <unordered_map>
 #include <vector>
 
 #include <remote_action.h>
@@ -67,8 +68,10 @@ public:
 
   int InitializeAudioOutput();
   int DestroyAudioOutput();
-  void ClearAudio();
-  void PushAudio(const char *data, size_t size);
+  // Serialized by GuiRuntime::audio_delivery_mutex_. Each peer has its own
+  // stream so SDL mixes simultaneous playback and muting clears only that peer.
+  void ClearAudio(const std::string& remote_id);
+  void PushAudio(const std::string& remote_id, const char *data, size_t size);
 
   bool SendKeyboardCommand(int key_code, bool is_down, uint32_t scan_code,
                            bool extended);
@@ -94,7 +97,8 @@ private:
                             bool from_secure_desktop);
 
   GuiRuntime &owner_;
-  SDL_AudioStream *output_stream_ = nullptr;
+  uint32_t output_device_ = 0;
+  std::unordered_map<std::string, SDL_AudioStream*> output_streams_;
   ScreenCapturerFactory *screen_capturer_factory_ = nullptr;
   ScreenCapturer *screen_capturer_ = nullptr;
   std::atomic<bool> cursor_capture_dirty_{true};
diff --git a/apps/desktop/src/gui/features/gallery/gallery_stream_settings.h b/apps/desktop/src/gui/features/gallery/gallery_stream_settings.h
new file mode 100644
index 00000000..562786e1
--- /dev/null
+++ b/apps/desktop/src/gui/features/gallery/gallery_stream_settings.h
@@ -0,0 +1,78 @@
+/*
+ * @Author: DI JUNKUN
+ * @Date: 2026-10-12
+ * Copyright (c) 2026 by DI JUNKUN, All Rights Reserved.
+ */
+
+#ifndef _GALLERY_STREAM_SETTINGS_H_
+#define _GALLERY_STREAM_SETTINGS_H_
+
+#include <algorithm>
+#include <array>
+#include <cstdint>
+#include <nlohmann/json.hpp>
+#include <optional>
+#include <preview_subscription.h>
+
+#include "preview_resolution.h"
+
+namespace crossdesk::gallery {
+struct StreamSettings {
+  // Persisted preset order: automatic, fixed bounds, then original size.
+  static constexpr std::array<PreviewResolution, 8> kResolutions{{
+      {}, {320, 180}, {640, 360}, {1280, 720}, {1920, 1080},
+      {2560, 1440}, {3840, 2160}, {}}};
+  static constexpr std::array<int, 4> kFrameRates{0, 15, 30, 60};
+  int resolution = 0;
+  int frame_rate = 0;  // 0 follows the session's existing 30/60 FPS preference.
+
+  static std::optional<StreamSettings> FromIndices(int resolution, int fps) {
+    if (resolution < 0 || resolution >= int(kResolutions.size()) ||
+        fps < 0 || fps >= int(kFrameRates.size()))
+      return {};
+    return StreamSettings{resolution, kFrameRates[fps]};
+  }
+  int FrameRateIndex() const {
+    return int(std::find(kFrameRates.begin(), kFrameRates.end(), frame_rate) -
+               kFrameRates.begin());
+  }
+  bool Valid() const {
+    return resolution >= 0 && resolution < int(kResolutions.size()) &&
+           FrameRateIndex() < int(kFrameRates.size());
+  }
+  static StreamSettings FromJson(const nlohmann::json& json) {
+    try {
+      if (!json.at("resolution").is_number_integer() ||
+          !json.at("frame_rate").is_number_integer()) return {};
+      const auto resolution = json.at("resolution").get<int64_t>();
+      const auto fps = json.at("frame_rate").get<int64_t>();
+      if (resolution < 0 || resolution >= int(kResolutions.size()) ||
+          fps < 0 || fps > 60) return {};
+      // Retired sparse presets migrate to the lowest current setting.
+      StreamSettings result{int(resolution), fps == 1 || fps == 8 ? 15 : int(fps)};
+      return result.Valid() ? result : StreamSettings{};
+    } catch (...) {
+      return {};
+    }
+  }
+  nlohmann::json ToJson() const {
+    return {{"resolution", resolution}, {"frame_rate", frame_rate}};
+  }
+  PreviewResolution Resolution(bool wall_managed, PreviewResolution wall_view,
+                               PreviewResolution stream_view) const {
+    if (!wall_managed) return {};
+    if (resolution != 0 && Valid()) return kResolutions[resolution];
+    // A square bound limits the longest edge of an unexpanded wall tile.
+    if (!wall_view.width && !stream_view.width) return {320, 320};
+    return {std::max(wall_view.width, stream_view.width),
+            std::max(wall_view.height, stream_view.height)};
+  }
+  void ApplyFrameRate(PreviewSubscription& demand, bool supports_fps15) const {
+    if (!Valid() || !frame_rate) return;
+    // Older peers reject fps=15. Keep their existing interactive wire format.
+    demand.fps = frame_rate == 15 && supports_fps15 ? 15 : 60;
+    demand.frame_rate = frame_rate <= 30 ? 30 : 60;
+  }
+};
+}  // namespace crossdesk::gallery
+#endif
diff --git a/apps/desktop/src/gui/features/gallery/gallery_workspace.h b/apps/desktop/src/gui/features/gallery/gallery_workspace.h
index 6ace61ce..81e8e0af 100644
--- a/apps/desktop/src/gui/features/gallery/gallery_workspace.h
+++ b/apps/desktop/src/gui/features/gallery/gallery_workspace.h
@@ -17,6 +17,7 @@
 #include <vector>
 
 #include "gallery_storage.h"
+#include "gallery_stream_settings.h"
 
 namespace crossdesk::gallery {
 struct Member {
@@ -33,6 +34,7 @@ struct Workspace {
   std::set<std::string> selected;
   int page = 0;
   int capacity = 6;
+  StreamSettings stream_settings;
 
   static std::string NormalizeId(const std::string &input) {
     std::string result;
@@ -181,6 +183,8 @@ struct Workspace {
       if (version == 2 && !doc.at("wall_ids").is_array())
         return false;
       Workspace loaded;
+      if (doc.contains("stream_settings"))
+        loaded.stream_settings = StreamSettings::FromJson(doc["stream_settings"]);
       for (const auto &member : doc.at("members")) {
         const auto id = member.at("id").get<std::string>();
         loaded.AddAssignment(id, member.value("group", ""));
@@ -197,6 +201,7 @@ struct Workspace {
       members = std::move(loaded.members);
       groups = std::move(loaded.groups);
       wall_ids_ = std::move(loaded.wall_ids_);
+      stream_settings = loaded.stream_settings;
       return true;
     } catch (...) {
       return false;
@@ -206,7 +211,8 @@ struct Workspace {
     try {
       nlohmann::json doc{{"version", 2},
                          {"members", nlohmann::json::array()},
-                         {"wall_ids", wall_ids_}};
+                         {"wall_ids", wall_ids_},
+                         {"stream_settings", stream_settings.ToJson()}};
       for (const auto &m : members)
         doc["members"].push_back({{"id", m.id}, {"group", m.group}});
       return WriteAtomically(path, doc.dump(2));
diff --git a/apps/desktop/src/gui/features/gallery/preview_resolution.h b/apps/desktop/src/gui/features/gallery/preview_resolution.h
new file mode 100644
index 00000000..b83378ac
--- /dev/null
+++ b/apps/desktop/src/gui/features/gallery/preview_resolution.h
@@ -0,0 +1,55 @@
+/*
+ * @Author: DI JUNKUN
+ * @Date: 2026-10-12
+ * Copyright (c) 2026 by DI JUNKUN, All Rights Reserved.
+ */
+
+#ifndef _PREVIEW_RESOLUTION_H_
+#define _PREVIEW_RESOLUTION_H_
+
+#include <algorithm>
+#include <chrono>
+#include <cmath>
+
+namespace crossdesk::gallery {
+struct PreviewResolution {
+  int width = 0;
+  int height = 0;
+
+  bool operator==(const PreviewResolution& other) const {
+    return width == other.width && height == other.height;
+  }
+  static PreviewResolution Viewport(float width, float height, float scale) {
+    if (!std::isfinite(width) || !std::isfinite(height) ||
+        !std::isfinite(scale) || width <= 0 || height <= 0 || scale <= 0)
+      return {};
+    return {int(std::clamp(std::ceil(double(width) * scale), 2.0, 16384.0)),
+            int(std::clamp(std::ceil(double(height) * scale), 2.0, 16384.0))};
+  }
+};
+
+class PreviewResolutionDebouncer {
+ public:
+  using Clock = std::chrono::steady_clock;
+  PreviewResolution Update(PreviewResolution desired, Clock::time_point now,
+                           bool reset = false) {
+    if (!initialized_ || reset) {
+      initialized_ = true;
+      applied_ = candidate_ = desired;
+      changed_at_ = now;
+    } else if (!(candidate_ == desired)) {
+      candidate_ = desired;
+      changed_at_ = now;
+    } else if (now - changed_at_ >= std::chrono::milliseconds(200)) {
+      applied_ = candidate_;
+    }
+    return applied_;
+  }
+
+ private:
+  bool initialized_ = false;
+  PreviewResolution applied_, candidate_;
+  Clock::time_point changed_at_{};
+};
+}  // namespace crossdesk::gallery
+#endif
diff --git a/apps/desktop/src/gui/runtime/connection_runtime.cpp b/apps/desktop/src/gui/runtime/connection_runtime.cpp
index e747e312..e8de5dd2 100644
--- a/apps/desktop/src/gui/runtime/connection_runtime.cpp
+++ b/apps/desktop/src/gui/runtime/connection_runtime.cpp
@@ -35,6 +35,30 @@ bool GuiRuntime::HasActiveSession() {
                      });
 }
 
+void GuiRuntime::MuteRemoteAudio(const std::shared_ptr<RemoteSession>& props) {
+  if (!props) return;
+  std::lock_guard delivery_lock(audio_delivery_mutex_);
+  props->audio_capture_button_pressed_ = false;
+  props->audio_allowed_ = false;
+  devices_.ClearAudio(props->remote_id_);
+  // Capable peers stop sending to this controller on the next subscription;
+  // old peers remain muted by the local receive gate above.
+  props->preview_needs_sync_ = true;
+}
+
+void GuiRuntime::UnmuteRemoteAudio(const std::shared_ptr<RemoteSession>& props) {
+  if (!props || props->closing_) return;
+  props->audio_capture_button_pressed_ = true;
+  props->preview_needs_sync_ = true;
+  // Also resume capture on old peers, or after a legacy controller stopped it.
+  RemoteAction action{};
+  action.type = ControlType::audio_capture;
+  action.a = true;
+  const auto message = action.to_json();
+  SendReliableDataFrame(props->peer_, message.data(), message.size(),
+                        props->control_data_label_.c_str());
+}
+
 void GuiRuntime::HandleConnectionStatusChange() {
   if (!signal_connected_ || !peer_) {
     return;
@@ -273,6 +297,7 @@ int GuiRuntime::ForceSignalReconnect() {
 
 void GuiRuntime::CloseRemoteSession(std::shared_ptr<RemoteSession> props) {
   if (!props || props->closing_.exchange(true)) return;
+  MuteRemoteAudio(props);
   if (props->peer_events_) props->peer_events_->Deactivate();
   props->connection_established_ = false;
   props->streaming_ = false;
@@ -484,6 +509,7 @@ void GuiRuntime::WaitForSessionCleanup() {
 void GuiRuntime::ResetRemoteSessionResources(
     std::shared_ptr<RemoteSession> props) {
   props->net_traffic_stats_.Reset();
+  props->received_video_stats_.Reset();
   {
     std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
     props->video_latency_->Reset();
@@ -657,6 +683,11 @@ int GuiRuntime::ConnectTo(const std::string& remote_id, const char* password,
   int ret = -1;
   auto props = FindRemoteSession(remote_id);
   if (!props || props->closing_) return -1;
+  if (background) {
+    // This also covers reusing a foreground connection that is awaiting auth.
+    props->wall_managed_ = true;
+    MuteRemoteAudio(props);
+  }
   if (!props->connection_established_) {
     if (!background) show_connection_status_window_ = true;
 
diff --git a/apps/desktop/src/gui/runtime/gui_runtime.h b/apps/desktop/src/gui/runtime/gui_runtime.h
index 7f753632..adc416aa 100644
--- a/apps/desktop/src/gui/runtime/gui_runtime.h
+++ b/apps/desktop/src/gui/runtime/gui_runtime.h
@@ -53,6 +53,9 @@ class GuiRuntime : protected gui_detail::GuiState {
   int ConnectTo(const std::string& remote_id, const char* password,
                 bool remember_password, bool bypass_presence_check = false,
                 bool background = false);
+  // UI thread: mute this receiver without stopping audio for other controllers.
+  void MuteRemoteAudio(const std::shared_ptr<RemoteSession>& props);
+  void UnmuteRemoteAudio(const std::shared_ptr<RemoteSession>& props);
   int RequestSingleDevicePresence(const std::string& remote_id,
                                   const char* password, bool remember_password);
   int ForceSignalReconnect();
diff --git a/apps/desktop/src/gui/runtime/net_traffic_stats_cache.h b/apps/desktop/src/gui/runtime/net_traffic_stats_cache.h
index 3028c105..b9deae82 100644
--- a/apps/desktop/src/gui/runtime/net_traffic_stats_cache.h
+++ b/apps/desktop/src/gui/runtime/net_traffic_stats_cache.h
@@ -24,6 +24,8 @@ class NetTrafficStatsCache {
                 "Network statistics require lock-free scalar atomics");
 
  public:
+  using Clock = std::chrono::steady_clock;
+
   void Store(const MiniRtcNetTrafficStats& stats) {
     video_inbound_stats_.Store(stats.video_inbound_stats);
     video_outbound_stats_.Store(stats.video_outbound_stats);
@@ -36,6 +38,10 @@ class NetTrafficStatsCache {
     srtp_active_.store(stats.srtp_active, std::memory_order_relaxed);
     rtt_ms_.store(stats.rtt_ms, std::memory_order_relaxed);
     connection_latency_.Update(stats.rtt_ms);
+    last_report_ms_.store(
+        std::chrono::duration_cast<std::chrono::milliseconds>(
+            Clock::now().time_since_epoch()).count(),
+        std::memory_order_relaxed);
   }
 
   MiniRtcNetTrafficStats Load() const {
@@ -65,9 +71,17 @@ class NetTrafficStatsCache {
 
   void ResetLatency() { connection_latency_.Reset(); }
 
+  bool HasRecentReport(Clock::time_point now = Clock::now()) const {
+    const auto last_report = last_report_ms_.load(std::memory_order_relaxed);
+    const auto now_ms = std::chrono::duration_cast<std::chrono::milliseconds>(
+                            now.time_since_epoch()).count();
+    return last_report > 0 && now_ms - last_report < 3000;
+  }
+
   void Reset() {
     Store(MiniRtcNetTrafficStats{});
     ResetLatency();
+    last_report_ms_.store(0, std::memory_order_relaxed);
   }
 
  private:
@@ -114,6 +128,7 @@ class NetTrafficStatsCache {
   OutboundStats total_outbound_stats_;
   std::atomic<bool> srtp_active_{false};
   std::atomic<double> rtt_ms_{-1};
+  std::atomic<int64_t> last_report_ms_{0};
   ConnectionLatencyStats connection_latency_;
 };
 
diff --git a/apps/desktop/src/gui/runtime/peer_data_callbacks.cpp b/apps/desktop/src/gui/runtime/peer_data_callbacks.cpp
index d251705a..9ac27f7e 100644
--- a/apps/desktop/src/gui/runtime/peer_data_callbacks.cpp
+++ b/apps/desktop/src/gui/runtime/peer_data_callbacks.cpp
@@ -168,20 +168,26 @@ void PeerEventHandler::OnReceiveDataBuffer(
     bool accepted = true;
     // Apply encoder quality to this controller only; other controllers retain
     // their own demand. Frame gating happens before encoding and transmission.
-    if (subscription->fps > 0 && runtime->preview_subscriptions_.IsNewer(
-                                     remote_id, subscription->request_id))
-      accepted = UpdateVideoSettings(
+    if (runtime->preview_subscriptions_.IsNewer(remote_id,
+                                               subscription->request_id)) {
+      if (subscription->fps > 0)
+        accepted = UpdateVideoSettings(
                      runtime->peer_, remote_id.data(), remote_id.size(),
                      static_cast<VideoQuality>(subscription->quality),
                      subscription->frame_rate,
                      static_cast<VideoDegradationPreference>(
                          subscription->EncoderPreference())) == 0;
-    if (accepted && runtime->preview_subscriptions_.Set(remote_id, *subscription) &&
-        subscription->fps > 0)
-      RequestAllVideoKeyFrames(runtime->peer_);
+      if (accepted)
+        accepted = UpdateVideoResolution(
+                       runtime->peer_, remote_id.data(), remote_id.size(),
+                       subscription->width, subscription->height) == 0;
+    }
+    // The resolution API refreshes only this controller's keyframes, including
+    // resume requests with unchanged dimensions. Do not disturb other viewers.
+    if (accepted) runtime->preview_subscriptions_.Set(remote_id, *subscription);
     const auto reply = nlohmann::json{
         {"type", "deskhub_preview_status"},
-        {"version", 1},
+        {"version", subscription->version},
         {"request_id", subscription->request_id},
         {"accepted",
          accepted}}.dump();
@@ -196,8 +202,11 @@ void PeerEventHandler::OnReceiveDataBuffer(
     if (auto props = runtime->FindRemoteSession(remote_id);
         props && source_id == props->control_data_label_) {
       try {
-        if (preview_json.at("version") == 1 &&
+        if ((preview_json.at("version") == 1 ||
+             preview_json.at("version") == 2) &&
             preview_json.at("request_id").is_number_unsigned() &&
+            preview_json.at("request_id").get<uint64_t>() > 0 &&
+            preview_json.at("request_id").get<uint64_t>() <= UINT32_MAX &&
             preview_json.at("accepted").is_boolean()) {
           props->preview_accepted_ = preview_json.at("accepted").get<bool>();
           props->preview_ack_ = preview_json.at("request_id").get<uint32_t>();
@@ -398,6 +407,9 @@ void PeerEventHandler::OnReceiveDataBuffer(
         const bool first_advertisement = !props->video_settings_supported_;
         props->preview_subscription_supported_ =
             remote_action.i.supports_deskhub_preview;
+        props->preview_resolution_supported_ =
+            remote_action.i.supports_deskhub_resolution;
+        props->preview_fps15_supported_ = remote_action.i.supports_deskhub_fps15;
         props->video_settings_supported_ =
             remote_action.i.supports_video_settings;
         if (first_advertisement && props->video_settings_supported_) {
diff --git a/apps/desktop/src/gui/runtime/peer_event_handler.cpp b/apps/desktop/src/gui/runtime/peer_event_handler.cpp
index 52267e02..4746444b 100644
--- a/apps/desktop/src/gui/runtime/peer_event_handler.cpp
+++ b/apps/desktop/src/gui/runtime/peer_event_handler.cpp
@@ -289,6 +289,8 @@ void PeerEventHandler::OnConnectionStatus(ConnectionStatus status,
               CROSSDESK_VERSION, kClientPlatform);
           remote_action.i.supports_video_settings = true;
           remote_action.i.supports_deskhub_preview = true;
+          remote_action.i.supports_deskhub_resolution = true;
+          remote_action.i.supports_deskhub_fps15 = true;
           for (std::size_t i = 0; i < remote_action.i.display_num; i++) {
             LOG_INFO("Local display [{}:{}]", i + 1,
                      remote_action.i.display_list[i]);
@@ -327,8 +329,15 @@ void PeerEventHandler::OnConnectionStatus(ConnectionStatus status,
           props->remote_update_dismissed_ = false;
         }
         props->net_traffic_stats_.Reset();
+        props->received_video_stats_.Reset();
+        props->traversal_mode_ = TraversalMode::UnknownMode;
         props->enable_mouse_control_ = false;
         props->preview_subscription_supported_ = false;
+        props->preview_resolution_supported_ = false;
+        props->preview_fps15_supported_ = false;
+        props->preview_needs_sync_ = true;
+        props->preview_ack_ = 0;
+        props->preview_accepted_ = false;
         props->audio_allowed_ = false;
         props->clipboard_allowed_ = false;
         runtime->ResetRemoteServiceStatus(*props);
@@ -429,6 +438,8 @@ void PeerEventHandler::OnConnectionStatus(ConnectionStatus status,
               CROSSDESK_VERSION, kClientPlatform);
           remote_action.i.supports_video_settings = true;
           remote_action.i.supports_deskhub_preview = true;
+          remote_action.i.supports_deskhub_resolution = true;
+          remote_action.i.supports_deskhub_fps15 = true;
           for (std::size_t i = 0; i < remote_action.i.display_num; i++) {
             LOG_INFO("Local display [{}:{}]", i + 1,
                      remote_action.i.display_list[i]);
@@ -545,7 +556,7 @@ void PeerEventHandler::OnNetStatusReport(
   if (props->traversal_mode_ != mode) {
     props->net_traffic_stats_.ResetLatency();
     props->traversal_mode_ = mode;
-    LOG_INFO("Net mode: [{}]", int(props->traversal_mode_));
+    LOG_INFO("Net mode: [{}]", int(props->traversal_mode_.load()));
   }
 
   if (!net_traffic_stats) {
diff --git a/apps/desktop/src/gui/runtime/peer_media_callbacks.cpp b/apps/desktop/src/gui/runtime/peer_media_callbacks.cpp
index 8e50cacc..7bcbd46a 100644
--- a/apps/desktop/src/gui/runtime/peer_media_callbacks.cpp
+++ b/apps/desktop/src/gui/runtime/peer_media_callbacks.cpp
@@ -50,6 +50,11 @@ void PeerEventHandler::OnReceiveVideoBuffer(
 
   if (props->connection_established_) {
     const auto timing_now = VideoLatencyFrame::Clock::now();
+    const auto* received_native = GetNativeVideoFrame(video_frame);
+    props->received_video_stats_.Record(
+        received_native ? received_native->width : video_frame->width,
+        received_native ? received_native->height : video_frame->height,
+        timing_now);
     // Convert only visible thumbnails, off the UI thread. A session retains
     // one latest RGBA image, not an unbounded queue of frames.
     const int preview_width = props->gallery_preview_width_.load();
@@ -274,10 +279,10 @@ void PeerEventHandler::OnReceiveAudioBuffer(
   std::lock_guard delivery_lock(runtime->audio_delivery_mutex_);
   const auto session =
       runtime->FindRemoteSession(std::string(user_id, user_id_size));
-  if (!session || !session->audio_allowed_.load()) return;
+  if (!session || session->closing_ || !session->audio_allowed_.load()) return;
   runtime->audio_buffer_fresh_ = true;
 
-  runtime->devices_.PushAudio(data, size);
+  runtime->devices_.PushAudio(session->remote_id_, data, size);
 }
 
 }  // namespace crossdesk
diff --git a/apps/desktop/src/gui/runtime/preview_subscriptions.h b/apps/desktop/src/gui/runtime/preview_subscriptions.h
index 8cc015ea..4a34f5df 100644
--- a/apps/desktop/src/gui/runtime/preview_subscriptions.h
+++ b/apps/desktop/src/gui/runtime/preview_subscriptions.h
@@ -24,13 +24,17 @@ public:
     std::lock_guard lock(mutex_);
     const auto found = states_.find(id);
     return found == states_.end() ||
-           request_id > found->second.request.request_id;
+           static_cast<int32_t>(request_id -
+                                found->second.request.request_id) > 0;
   }
   bool Set(const std::string &id, const PreviewSubscription &request) {
     std::lock_guard lock(mutex_);
-    auto &state = states_[id];
-    if (request.request_id <= state.request.request_id)
+    const auto found = states_.find(id);
+    if (found != states_.end() &&
+        static_cast<int32_t>(request.request_id -
+                             found->second.request.request_id) <= 0)
       return false;
+    auto &state = states_[id];
     state.request = request;
     state.next.clear();
     return true;
@@ -49,6 +53,15 @@ public:
     if (state.request.fps == 60)
       return true;
     auto &next = state.next[stream];
+    if (state.request.fps == 15) {
+      // Keep a stable 15 FPS deadline across capture jitter. Rebasing every
+      // frame can turn small timing errors into extra dropped capture frames.
+      const auto interval = std::chrono::nanoseconds(1'000'000'000 / 15);
+      if (now + std::chrono::milliseconds(1) < next) return false;
+      next = next == Clock::time_point{} || now - next > interval
+          ? now + interval : next + interval;
+      return true;
+    }
     if (now < next)
       return false;
     next = now + std::chrono::milliseconds(1000 / state.request.fps);
diff --git a/apps/desktop/src/gui/runtime/received_video_stats.h b/apps/desktop/src/gui/runtime/received_video_stats.h
new file mode 100644
index 00000000..057bd1e1
--- /dev/null
+++ b/apps/desktop/src/gui/runtime/received_video_stats.h
@@ -0,0 +1,72 @@
+/*
+ * @Author: DI JUNKUN
+ * @Date: 2026-10-12
+ * Copyright (c) 2026 by DI JUNKUN, All Rights Reserved.
+ */
+
+#ifndef _RECEIVED_VIDEO_STATS_H_
+#define _RECEIVED_VIDEO_STATS_H_
+
+#include <chrono>
+#include <cmath>
+#include <mutex>
+#include <optional>
+
+namespace crossdesk::gui_detail {
+// Measured at decode delivery, including wall-only and background sessions.
+// Independent of the selected window's presentation cadence and FPS setting.
+class ReceivedVideoStats {
+ public:
+  using Clock = std::chrono::steady_clock;
+  struct Snapshot {
+    int width = 0;
+    int height = 0;
+    std::optional<int> fps;
+  };
+
+  void Record(int width, int height, Clock::time_point now = Clock::now()) {
+    if (width <= 0 || height <= 0) return;
+    std::lock_guard lock(mutex_);
+    const bool restart = snapshot_.width == 0 ||
+                         now - last_frame_ >= std::chrono::seconds(3);
+    snapshot_.width = width;
+    snapshot_.height = height;
+    last_frame_ = now;
+    if (restart) {
+      started_ = now;
+      frames_ = 0;
+      snapshot_.fps.reset();
+      return;
+    }
+    ++frames_;
+    const double elapsed = std::chrono::duration<double>(now - started_).count();
+    if (elapsed >= 1.0) {
+      snapshot_.fps = static_cast<int>(std::lround(frames_ / elapsed));
+      frames_ = 0;
+      started_ = now;
+    }
+  }
+
+  Snapshot Get(Clock::time_point now = Clock::now()) const {
+    std::lock_guard lock(mutex_);
+    auto result = snapshot_;
+    if (result.width > 0 && now - last_frame_ >= std::chrono::seconds(1))
+      result.fps = 0;
+    return result;
+  }
+
+  void Reset() {
+    std::lock_guard lock(mutex_);
+    snapshot_ = {};
+    frames_ = 0;
+    started_ = last_frame_ = {};
+  }
+
+ private:
+  mutable std::mutex mutex_;
+  Snapshot snapshot_;
+  unsigned frames_ = 0;
+  Clock::time_point started_{}, last_frame_{};
+};
+}  // namespace crossdesk::gui_detail
+#endif
diff --git a/apps/desktop/src/gui/runtime/remote_session.h b/apps/desktop/src/gui/runtime/remote_session.h
index 2fff633e..3689d89c 100644
--- a/apps/desktop/src/gui/runtime/remote_session.h
+++ b/apps/desktop/src/gui/runtime/remote_session.h
@@ -23,10 +23,12 @@
 #include <preview_subscription.h>
 #include <stream_names.h>
 #include "display_info.h"
+#include "features/gallery/preview_resolution.h"
 #include "cursor_presentation.h"
 #include "minirtc.h"
 #include "rendering/video_latency.h"
 #include "runtime/net_traffic_stats_cache.h"
+#include "runtime/received_video_stats.h"
 #include "runtime/connection_auth_state.h"
 
 namespace crossdesk { class PeerEventHandler; }
@@ -74,10 +76,14 @@ struct RemoteSession {
   // Wall membership, stream-window visibility and input ownership are separate.
   std::atomic<bool> wall_managed_{false};
   std::atomic<bool> preview_subscription_supported_{false};
+  std::atomic<bool> preview_resolution_supported_{false};
+  std::atomic<bool> preview_fps15_supported_{false};
+  std::atomic<bool> preview_needs_sync_{true};
   std::atomic<uint32_t> preview_ack_{0};
   std::atomic<bool> preview_accepted_{false};
   uint32_t preview_request_ = 0;
   PreviewSubscription preview_requested_;
+  gallery::PreviewResolutionDebouncer preview_resolution_;
   std::chrono::steady_clock::time_point preview_request_at_{};
   std::atomic<bool> clipboard_allowed_{false};
   std::atomic<uint64_t> input_generation_{0};
@@ -189,13 +195,14 @@ struct RemoteSession {
   CursorPresentation cursor_presentation_;
   // Shared by minirtc callbacks, Slint rendering and SDL audio callbacks.
   std::atomic<ConnectionStatus> connection_status_ = ConnectionStatus::Closed;
-  TraversalMode traversal_mode_ = TraversalMode::UnknownMode;
+  std::atomic<TraversalMode> traversal_mode_{TraversalMode::UnknownMode};
   int fps_ = 0;
   int frame_count_ = 0;
   std::chrono::steady_clock::time_point last_time_;
   // UI-thread snapshot refreshed with FPS once per second.
   std::optional<VideoLatencyStats::Snapshot> video_latency_snapshot_;
   NetTrafficStatsCache net_traffic_stats_;
+  ReceivedVideoStats received_video_stats_;
 
   using QueuedFile = FileTransferState::QueuedFile;
   using FileTransferStatus = FileTransferState::FileTransferStatus;
diff --git a/apps/desktop/src/gui/ui/common.slint b/apps/desktop/src/gui/ui/common.slint
index 2b677fd9..c1cfb567 100644
--- a/apps/desktop/src/gui/ui/common.slint
+++ b/apps/desktop/src/gui/ui/common.slint
@@ -173,6 +173,8 @@ export component CompactComboBox inherits Rectangle {
     in property <[string]> model;
     in-out property <int> current-index: 0;
     in property <bool> enabled: true;
+    in property <bool> subtle: false;
+    in property <bool> show-arrow: true;
     property <bool> popup-animation-enabled: false;
     property <float> popup-progress: 0.0;
     callback selected(int);
@@ -185,29 +187,29 @@ export component CompactComboBox inherits Rectangle {
 
     width: 73px;
     height: 24px;
-    background: root.enabled ? white : #f1f1f1;
+    background: root.enabled ? (root.subtle ? #f8fafc : white) : root.subtle ? #f1f3f6 : #f1f1f1;
     border-width: 1px;
-    border-color: #bfc2c7;
-    border-radius: 3px;
+    border-color: root.subtle ? #dfe6ef : #bfc2c7;
+    border-radius: root.subtle ? 6px : 3px;
 
     Text {
-        x: 5px;
-        width: parent.width - 24px;
+        x: root.subtle ? 10px : 5px;
+        width: parent.width - (root.show-arrow ? (root.subtle ? 36px : 24px) : (root.subtle ? 20px : 10px));
         text: root.model[root.current-index];
         color: root.enabled ? #202124 : #8b8f95;
-        font-size: ImGuiFontStyle.body;
+        font-size: root.subtle ? 12px : ImGuiFontStyle.body;
         overflow: elide;
         vertical-alignment: center;
     }
-    Rectangle {
-        x: parent.width - 21px;
+    if root.show-arrow: Rectangle {
+        x: parent.width - (root.subtle ? 27px : 21px);
         width: 20px;
         height: parent.height - 2px;
         y: 1px;
-        background: root.enabled ? #9bc9f8 : #d7d9dc;
+        background: root.subtle ? transparent : root.enabled ? #9bc9f8 : #d7d9dc;
         Text {
             text: FontAwesomeIcons.angle-down;
-            color: #202124;
+            color: root.subtle ? #79879a : #202124;
             font-family: "Font Awesome 6 Free";
             font-weight: 900;
             font-size: 10px;
@@ -222,7 +224,7 @@ export component CompactComboBox inherits Rectangle {
         }
     }
     TouchArea {
-        enabled: root.enabled;
+        enabled: root.enabled; mouse-cursor: pointer;
         clicked => {
             root.popup-animation-enabled = false;
             root.popup-progress = 0.0;
@@ -261,15 +263,15 @@ export component CompactComboBox inherits Rectangle {
             opacity: root.popup-progress;
             background: white;
             border-width: 1px;
-            border-color: #bfc2c7;
-            border-radius: 3px;
+            border-color: root.subtle ? #dfe6ef : #bfc2c7;
+            border-radius: root.subtle ? 6px : 3px;
             clip: true;
             for choice[index] in root.model: Rectangle {
                 y: index * 23px;
                 width: parent.width;
                 height: 23px;
                 background: option-touch.has-hover ? #dbeafb : index == root.current-index ? #eef5fd : white;
-                Text { x: 5px; width: parent.width - 10px; text: choice; color: #202124; font-size: ImGuiFontStyle.body; overflow: elide; vertical-alignment: center; }
+                Text { x: 5px; width: parent.width - 10px; text: choice; color: #202124; font-size: root.subtle ? 12px : ImGuiFontStyle.body; overflow: elide; vertical-alignment: center; }
                 option-touch := TouchArea {
                     clicked => {
                         popup-open-timer.running = false;
@@ -286,8 +288,8 @@ export component CompactComboBox inherits Rectangle {
                 height: parent.height;
                 background: transparent;
                 border-width: 1px;
-                border-color: #bfc2c7;
-                border-radius: 3px;
+                border-color: root.subtle ? #dfe6ef : #bfc2c7;
+                border-radius: root.subtle ? 6px : 3px;
                 z: 2;
             }
         }
diff --git a/apps/desktop/src/gui/ui/crossdesk_ui.slint b/apps/desktop/src/gui/ui/crossdesk_ui.slint
index 7d0817bc..16b30d89 100644
--- a/apps/desktop/src/gui/ui/crossdesk_ui.slint
+++ b/apps/desktop/src/gui/ui/crossdesk_ui.slint
@@ -7,4 +7,5 @@ export { ServerWindow, ServerStatusBar, ServerStrings, ControllerEntry } from "s
 
 export { GalleryTile, GalleryRecentDevice, GalleryActionDevice } from "gallery_view.slint";
 export { GalleryStrings } from "device_strings.slint";
+export { GalleryNetworkDevice } from "gallery_network_dialog.slint";
 export { DeviceGroupOption } from "device_group_dialog.slint";
diff --git a/apps/desktop/src/gui/ui/gallery_network_dialog.slint b/apps/desktop/src/gui/ui/gallery_network_dialog.slint
new file mode 100644
index 00000000..c30f9294
--- /dev/null
+++ b/apps/desktop/src/gui/ui/gallery_network_dialog.slint
@@ -0,0 +1,225 @@
+import { GalleryStrings } from "device_strings.slint";
+import { CompactButton } from "common.slint";
+import { ScrollView } from "std-widgets.slint";
+
+export struct GalleryNetworkDevice {
+    name: string,
+    id: string,
+    mode: string,
+    encryption-known: bool,
+    encryption-enabled: bool,
+    latency: string,
+    inbound: string,
+    outbound: string,
+    loss: string,
+    resolution: string,
+    fps: string,
+}
+
+component NetworkRow inherits Rectangle {
+    in property <GalleryNetworkDevice> device;
+    in property <bool> heading: false;
+    // Keep the same column geometry in the header and every row. Grouping
+    // related values leaves room for device names even in the 640px window.
+    HorizontalLayout {
+        x: 0px; y: 0px; width: parent.width; height: parent.height;
+        padding-left: 12px; padding-right: 12px; spacing: 10px;
+        identity := Rectangle {
+            horizontal-stretch: 1;
+            device-name := Text {
+                y: root.heading ? 0px : 11px; height: root.heading ? parent.height : 20px;
+                width: parent.width; text: root.device.name;
+                font-size: root.heading ? 11px : 12px; font-weight: 600;
+                color: root.heading ? #6b7785 : #293746;
+                vertical-alignment: center; overflow: elide;
+            }
+            name-hover := TouchArea {
+                y: 11px; height: 20px; width: parent.width;
+                enabled: !root.heading;
+            }
+            if !root.heading: HorizontalLayout {
+                x: 0px; y: 34px; width: parent.width; height: 17px; spacing: 4px;
+                id-text := Text {
+                    text: root.device.id; font-size: 10px; color: #7a8490;
+                    vertical-alignment: center; overflow: elide;
+                }
+                Rectangle {
+                    width: max(0px, min(mode-text.preferred-width + 12px,
+                        parent.width - id-text.preferred-width - encryption-badge.width - 12px));
+                    background: #edf2f7; border-radius: 3px;
+                    mode-text := Text {
+                        x: 6px; width: parent.width - 12px; height: parent.height;
+                        text: root.device.mode; font-size: 10px; color: #586f87;
+                        horizontal-alignment: center; vertical-alignment: center; overflow: elide;
+                    }
+                }
+                encryption-badge := Rectangle {
+                    width: encryption-text.preferred-width + 12px;
+                    background: !root.device.encryption-known ? #f0f2f5
+                        : root.device.encryption-enabled ? #e8f5ec : #fff3df;
+                    border-radius: 3px;
+                    encryption-text := Text {
+                        x: 6px; width: parent.width - 12px; height: parent.height;
+                        text: !root.device.encryption-known
+                            ? GalleryStrings.tr("待确认", "Unknown", "Неизвестно")
+                            : root.device.encryption-enabled
+                                ? GalleryStrings.tr("已加密", "Encrypted", "Защищено")
+                                : GalleryStrings.tr("未加密", "Unencrypted", "Без шифр.");
+                        color: !root.device.encryption-known ? #7a8490
+                            : root.device.encryption-enabled ? #18794e : #8a6428;
+                        font-size: 10px; horizontal-alignment: center;
+                        vertical-alignment: center; overflow: elide;
+                    }
+                }
+                Rectangle { horizontal-stretch: 1; }
+            }
+        }
+        Rectangle {
+            width: max(108px, root.width * 0.19);
+            Text {
+                y: root.heading ? 0px : 11px; height: root.heading ? parent.height : 20px;
+                width: parent.width;
+                text: root.heading ? GalleryStrings.tr("画面", "Video", "Видео") : root.device.resolution;
+                font-size: root.heading ? 11px : 12px; font-weight: root.heading ? 600 : 400;
+                color: root.heading ? #6b7785 : #293746;
+                vertical-alignment: center; overflow: elide;
+            }
+            if !root.heading: Text {
+                y: 34px; height: 17px; width: parent.width;
+                text: root.device.fps; font-size: 11px; color: #7a8490;
+                vertical-alignment: center; overflow: elide;
+            }
+        }
+        Rectangle {
+            width: max(100px, root.width * 0.18);
+            if root.heading: Text {
+                x: 0px; width: parent.width;
+                text: GalleryStrings.tr("收发速率", "Transfer rate", "Скорость");
+                font-size: 11px; font-weight: 600; color: #6b7785;
+                vertical-alignment: center; overflow: elide;
+            }
+            if !root.heading: Text {
+                x: 0px; y: 11px; height: 20px; width: 14px;
+                text: "↓"; color: #2676b9; font-size: 12px; vertical-alignment: center;
+            }
+            if !root.heading: Text {
+                x: 17px; y: 11px; height: 20px; width: parent.width - 17px;
+                text: root.device.inbound; color: #293746; font-size: 12px;
+                vertical-alignment: center; overflow: elide;
+            }
+            if !root.heading: Text {
+                x: 0px; y: 34px; height: 17px; width: 14px;
+                text: "↑"; color: #7a8490; font-size: 11px; vertical-alignment: center;
+            }
+            if !root.heading: Text {
+                x: 17px; y: 34px; height: 17px; width: parent.width - 17px;
+                text: root.device.outbound; color: #7a8490; font-size: 11px;
+                vertical-alignment: center; overflow: elide;
+            }
+        }
+        Rectangle {
+            width: max(94px, root.width * 0.16);
+            Text {
+                y: root.heading ? 0px : 11px; height: root.heading ? parent.height : 20px;
+                width: parent.width;
+                text: root.heading ? GalleryStrings.tr("网络质量", "Network quality", "Качество сети") : "RTT  " + root.device.latency;
+                font-size: 11px; font-weight: root.heading ? 600 : 400;
+                color: root.heading ? #6b7785 : #293746;
+                vertical-alignment: center; overflow: elide;
+            }
+            if !root.heading: Text {
+                y: 34px; height: 17px; width: parent.width;
+                text: GalleryStrings.tr("丢包  ", "Loss  ", "Потери  ") + root.device.loss;
+                font-size: 11px; color: #7a8490;
+                vertical-alignment: center; overflow: elide;
+            }
+        }
+    }
+    if !root.heading && name-hover.has-hover && device-name.preferred-width > identity.width: Rectangle {
+        x: 12px; y: 32px; width: min(name-tip.preferred-width + 20px, root.width - 24px);
+        height: 26px; background: #293746; border-radius: 4px; z: 10;
+        name-tip := Text {
+            x: 10px; width: parent.width - 20px; height: parent.height;
+            text: root.device.name; font-size: 11px; color: white;
+            vertical-alignment: center; overflow: elide;
+        }
+    }
+}
+
+component NetworkEmptyState inherits Rectangle {
+    VerticalLayout {
+        alignment: center; spacing: 8px;
+        Text {
+            text: GalleryStrings.tr("暂无已连接设备", "No connected devices", "Нет подключённых устройств");
+            font-size: 13px; color: #596878; horizontal-alignment: center;
+        }
+        Text {
+            text: GalleryStrings.tr("建立连接后，网络和画面信息将在此显示", "Network and video details appear here once connected", "После подключения здесь появятся данные сети и видео");
+            font-size: 11px; color: #8a95a1; horizontal-alignment: center;
+        }
+    }
+}
+
+export component GalleryNetworkDialog inherits Rectangle {
+    in property <[GalleryNetworkDevice]> devices;
+    callback close();
+    background: #00000042;
+    TouchArea { clicked => { root.close(); } }
+    Rectangle {
+        x: (parent.width - self.width) / 2;
+        y: (parent.height - self.height) / 2;
+        width: min(960px, parent.width - 32px);
+        height: min(560px, parent.height - 24px);
+        background: white; border-radius: 8px;
+        border-width: 1px; border-color: #c6cdd5;
+        TouchArea {}
+        FocusScope {
+            init => { self.focus(); }
+            key-pressed(event) => {
+                if event.text == Key.Escape { root.close(); }
+                accept
+            }
+        }
+        Text {
+            x: 20px; y: 17px; width: parent.width - 120px; height: 24px;
+            text: GalleryStrings.tr("设备网络状态", "Device network status", "Сеть устройств");
+            font-size: 17px; font-weight: 600; color: #293746;
+        }
+        CompactButton {
+            x: parent.width - 80px; y: 17px; width: 60px; height: 26px;
+            text: GalleryStrings.tr("关闭", "Close", "Закрыть"); clicked => { root.close(); }
+        }
+        Rectangle {
+            x: 20px; y: 54px; width: 6px; height: 6px; border-radius: 3px;
+            background: root.devices.length > 0 ? #27a168 : #a7b0ba;
+        }
+        Text {
+            x: 32px; y: 48px; width: parent.width - 52px; height: 18px;
+            text: GalleryStrings.tr("已连接设备 · ", "Connected devices · ", "Подключённые устройства · ") + root.devices.length
+                + GalleryStrings.tr(" 台 · 每秒更新", " · Updates every second", " · Обновление раз в секунду");
+            font-size: 11px; color: #7a8490; overflow: elide;
+        }
+        NetworkRow {
+            x: 12px; y: 78px; width: parent.width - 38px; height: 30px;
+            heading: true; background: #f3f5f8; border-radius: 4px;
+            device: {
+                name: GalleryStrings.tr("设备 / ID", "Device / ID", "Устройство / ID"),
+            };
+        }
+        list := ScrollView {
+            x: 12px; y: 108px; width: parent.width - 24px;
+            height: parent.height - self.y - 12px;
+            viewport-width: self.width - 14px;
+            viewport-height: max(self.height, root.devices.length * 62px);
+            horizontal-scrollbar-policy: always-off;
+            for device[index] in root.devices: NetworkRow {
+                y: index * 62px; width: list.viewport-width; height: 62px;
+                device: device; background: mod(index, 2) == 0 ? white : #f8fafc;
+                Rectangle { y: parent.height - 1px; height: 1px; background: #edf0f4; }
+            }
+        }
+        if root.devices.length == 0: NetworkEmptyState {
+            x: list.x; y: list.y; width: list.width; height: list.height;
+        }
+    }
+}
diff --git a/apps/desktop/src/gui/ui/gallery_settings.slint b/apps/desktop/src/gui/ui/gallery_settings.slint
new file mode 100644
index 00000000..8eb21d2a
--- /dev/null
+++ b/apps/desktop/src/gui/ui/gallery_settings.slint
@@ -0,0 +1,36 @@
+import { GalleryStrings } from "device_strings.slint";
+import { SettingsGroup, SettingsRow, SettingsSelect } from "settings_controls.slint";
+
+export component GallerySettings inherits Rectangle {
+    in-out property <int> resolution-index: 0;
+    in-out property <int> frame-rate-index: 0;
+    in property <string> error;
+    SettingsGroup {
+        y: 0px; width: parent.width;
+        title: GalleryStrings.tr("画面传输", "Video transmission", "Передача видео"); rows: 2;
+        SettingsRow {
+            label: GalleryStrings.tr("分辨率上限", "Resolution limit", "Разрешение");
+            label-reserve: self.width - 112px;
+            SettingsSelect {
+                x: 136px; y: 4px; width: parent.width - 150px;
+                current-index <=> root.resolution-index;
+                model: [GalleryStrings.tr("自动", "Auto", "Авто"),
+                    "320 × 180", "640 × 360", "1280 × 720", "1920 × 1080", "2560 × 1440", "3840 × 2160",
+                    GalleryStrings.tr("原始分辨率", "Original resolution", "Исходное разрешение")];
+            }
+        }
+        SettingsRow {
+            label: GalleryStrings.tr("帧率", "Frame rate", "Частота кадров");
+            label-reserve: self.width - 112px; divider: false;
+            SettingsSelect {
+                x: 136px; y: 4px; width: parent.width - 150px;
+                current-index <=> root.frame-rate-index;
+                model: [GalleryStrings.tr("跟随设备设置", "Follow device settings", "Настройки устройства"), "15 FPS", "30 FPS", "60 FPS"];
+            }
+        }
+    }
+    if root.error != "": Text {
+        x: 2px; y: 108px; width: parent.width - 4px; height: 32px;
+        text: root.error; color: #c53e3e; font-size: 11px; wrap: word-wrap;
+    }
+}
diff --git a/apps/desktop/src/gui/ui/gallery_view.slint b/apps/desktop/src/gui/ui/gallery_view.slint
index b1a622dc..5f4a7f64 100644
--- a/apps/desktop/src/gui/ui/gallery_view.slint
+++ b/apps/desktop/src/gui/ui/gallery_view.slint
@@ -29,6 +29,8 @@ export struct GalleryActionDevice {
 }
 export component GalleryView inherits Rectangle {
     in property <bool> controlling: false;
+    in property <bool> simplified: false;
+    private property <length> grid-gap: root.simplified ? 6px : 12px;
     // Pointer mapping must use the exact image viewport, including its inset.
     out property <float> video-width: video.width / 1px;
     out property <float> video-height: video.height / 1px;
@@ -63,6 +65,8 @@ export component GalleryView inherits Rectangle {
     in property <int> count: 0;
     in property <int> connected-count: 0;
     in property <int> selected-count: 0;
+    in property <bool> selected-audio-available: false;
+    in property <bool> selected-audio-muted: false;
     in property <int> hidden-selected: 0;
     in property <string> notice;
     in property <GalleryTile> focused;
@@ -91,7 +95,7 @@ export component GalleryView inherits Rectangle {
     }
     toolbar := HorizontalLayout {
         x: 29px; y: 12px; width: parent.width - 58px; height: 24px;
-        visible: root.focused.id == "";
+        visible: root.focused.id == "" && !root.simplified;
         spacing: 8px;
         GroupFilter { width: 155px; height: 24px; system-count: 1; model: root.groups; current-index <=> root.group-index;
             selected(index) => { root.action("group", index); }
@@ -102,30 +106,35 @@ export component GalleryView inherits Rectangle {
         CompactButton { width: 90px; primary: true; text: GalleryStrings.tr("添加设备", "Add device", "Добавить"); clicked => { root.action("add-open", ""); root.adding = true; } }
     }
     grid := Rectangle {
-        x: toolbar.x; y: toolbar.y + toolbar.height + 12px; width: toolbar.width;
-        height: footer.y - 12px - self.y;
+        x: root.simplified ? 12px : toolbar.x;
+        y: root.simplified ? 12px : toolbar.y + toolbar.height + 12px;
+        width: parent.width - self.x * 2;
+        height: (root.simplified && root.pages <= 1 ? parent.height - 12px : footer.y - 12px) - self.y;
         visible: root.focused.id == "";
         for tile[index] in root.tiles: Rectangle {
-            x: mod(index, root.columns) * (grid.width + 12px) / root.columns;
-            y: floor(index / root.columns) * (grid.height + 12px) / root.rows;
-            width: (grid.width - (root.columns - 1) * 12px) / root.columns;
-            height: (grid.height - (root.rows - 1) * 12px) / root.rows;
-            border-radius: 6px; background: tile.selected ? #eaf3ff : #eff0f2;
-            border-width: tile.selected ? 2px : 1px;
+            x: mod(index, root.columns) * (grid.width + root.grid-gap) / root.columns;
+            y: floor(index / root.columns) * (grid.height + root.grid-gap) / root.rows;
+            width: (grid.width - (root.columns - 1) * root.grid-gap) / root.columns;
+            height: (grid.height - (root.rows - 1) * root.grid-gap) / root.rows;
+            border-radius: root.simplified ? 0px : 6px;
+            background: root.simplified ? #24272d : tile.selected ? #eaf3ff : #eff0f2;
+            border-width: root.simplified ? 0px : tile.selected ? 2px : 1px;
             border-color: tile.selected ? #76aeea : root.batch && tile-touch.has-hover ? #94bdeb : #c9cdd2;
             Rectangle {
-                x: 6px; y: 6px; width: parent.width - 12px; height: parent.height - 36px;
+                x: root.simplified ? 0px : 6px; y: self.x;
+                width: parent.width - self.x * 2;
+                height: root.simplified ? parent.height : parent.height - 36px;
                 background: #24272d;
                 if tile.has-frame: Image { x: 0px; y: 0px; width: parent.width; height: parent.height; source: tile.frame; image-fit: contain; opacity: tile.stale ? 0.45 : 1; }
-                if !tile.has-frame || !tile.connected || tile.stale: Text {
+                if !root.simplified && (!tile.has-frame || !tile.connected || tile.stale): Text {
                     text: tile.status; color: #ffffff; font-size: 12px;
                     horizontal-alignment: center; vertical-alignment: center;
                     wrap: word-wrap;
                 }
             }
-            Text { x: 9px; y: parent.height - 28px; width: (tile-touch.has-hover && !root.batch ? parent.width - DeviceCardStyle.toolbar-width - 6px : presence-badge.x) - 17px; height: 28px; text: tile.name; color: #24272d; font-size: 12px; overflow: elide; vertical-alignment: center; }
+            Text { visible: !root.simplified; x: 9px; y: parent.height - 28px; width: (tile-touch.has-hover && !root.batch ? parent.width - DeviceCardStyle.toolbar-width - 6px : presence-badge.x) - 17px; height: 28px; text: tile.name; color: #24272d; font-size: 12px; overflow: elide; vertical-alignment: center; }
             presence-badge := Rectangle {
-                visible: root.batch || !tile-touch.has-hover;
+                visible: !root.simplified && (root.batch || !tile-touch.has-hover);
                 x: parent.width - (root.batch ? 35px : 9px) - self.width; y: parent.height - 23px;
                 width: presence-label.preferred-width + 12px; height: 18px;
                 border-radius: 9px; background: tile.online ? #eaf6ee : #e2e5e9;
@@ -135,7 +144,7 @@ export component GalleryView inherits Rectangle {
                     color: tile.online ? #17854c : #62666d; font-size: 10px; vertical-alignment: center;
                 }
             }
-            if root.batch: Rectangle {
+            if root.batch && !root.simplified: Rectangle {
                 x: parent.width - 27px; y: parent.height - 23px;
                 width: 18px; height: 18px; border-radius: 5px; border-width: 1px;
                 background: tile.selected ? (tile-touch.pressed ? #5c9fdf : tile-touch.has-hover ? #659fe0 : #6dabea) : tile-touch.has-hover ? #f3f8fe : white;
@@ -148,8 +157,8 @@ export component GalleryView inherits Rectangle {
                 }
             }
             tile-touch := TouchArea {
-                clicked => { root.action(root.batch ? "select" : "focus", tile.id); }
-                if tile-touch.has-hover && !root.batch: DeviceCardActions {
+                clicked => { root.action(root.batch && !root.simplified ? "select" : "focus", tile.id); }
+                if tile-touch.has-hover && !root.batch && !root.simplified: DeviceCardActions {
                     x: parent.width - self.width - 6px; y: parent.height - 26px;
                     remove-label: GalleryStrings.tr("从桌面墙移除", "Remove from DeskHub", "Убрать из DeskHub");
                     connected: tile.connected;
@@ -162,14 +171,16 @@ export component GalleryView inherits Rectangle {
             }
         }
         if root.count == 0: Text {
-            text: GalleryStrings.tr("添加设备，建立你的桌面墙", "Add devices to build your DeskHub", "Добавьте устройства в DeskHub");
+            text: root.simplified
+                ? GalleryStrings.tr("暂无设备，退出精简模式后可添加", "No devices. Exit compact mode to add devices", "Нет устройств. Выйдите из компактного режима, чтобы добавить их")
+                : GalleryStrings.tr("添加设备，建立你的桌面墙", "Add devices to build your DeskHub", "Добавьте устройства в DeskHub");
             color: #808080; horizontal-alignment: center; vertical-alignment: center;
         }
     }
     focus-view := Rectangle {
         visible: root.focused.id != "";
         x: 29px; y: 7px; width: parent.width - 58px;
-        height: parent.height - 51px;
+        height: parent.height - (root.simplified && root.pages <= 1 ? 19px : 51px);
         HorizontalLayout {
             x: 0px; y: 0px; width: parent.width; height: 28px; spacing: 8px;
             CompactButton { width: 52px; text: GalleryStrings.tr("返回", "Back", "Назад"); clicked => { root.action("focus", ""); } }
@@ -256,20 +267,21 @@ export component GalleryView inherits Rectangle {
                 border-width: tile.id == root.focused.id ? 2px : 1px;
                 border-color: tile.id == root.focused.id ? #76aeea : #d5dbe3;
                 Rectangle {
-                    x: 5px; y: 5px; width: 126px; height: 52px; background: #24272d;
+                    x: 5px; y: 5px; width: 126px; height: root.simplified ? 82px : 52px; background: #24272d;
                     if tile.has-frame: Image { width: parent.width; height: parent.height; source: tile.frame; image-fit: contain; opacity: tile.stale || !tile.connected ? 0.4 : 1; }
-                    if !tile.has-frame || tile.stale || !tile.connected: Text {
+                    if !root.simplified && (!tile.has-frame || tile.stale || !tile.connected): Text {
                         text: tile.status; color: #e2e6ed; font-size: 10px; overflow: elide;
                         horizontal-alignment: center; vertical-alignment: center;
                     }
                 }
-                Text { x: 7px; y: 61px; width: 122px; height: 16px; text: tile.name; color: #303943; font-size: 11px; overflow: elide; }
+                Text { visible: !root.simplified; x: 7px; y: 61px; width: 122px; height: 16px; text: tile.name; color: #303943; font-size: 11px; overflow: elide; }
                 Text {
+                    visible: !root.simplified;
                     x: 7px; y: 78px; width: 86px; height: 12px; font-size: 9px;
                     text: tile.online ? GalleryStrings.tr("在线", "Online", "В сети") : tile.presence-known ? GalleryStrings.tr("离线", "Offline", "Не в сети") : GalleryStrings.tr("未知", "Unknown", "Неизвестно");
                     color: tile.online ? #17854c : #7a828d; overflow: elide;
                 }
-                if tile.id == root.focused.id: Text {
+                if !root.simplified && tile.id == root.focused.id: Text {
                     x: 99px; y: 78px; width: 30px; height: 12px;
                     text: GalleryStrings.tr("当前", "Current", "Выбрано"); color: #4d83bd; font-size: 9px; horizontal-alignment: right; overflow: elide;
                 }
@@ -280,8 +292,9 @@ export component GalleryView inherits Rectangle {
     // Reuse the footer for selection actions so entering batch mode never
     // changes card geometry or moves a device beneath the pointer.
     footer := HorizontalLayout {
-        x: toolbar.x; y: parent.height - 36px; width: toolbar.width; height: 24px; spacing: 12px;
-        if root.batch: CompactButton {
+        x: toolbar.x; y: parent.height - 36px; width: toolbar.width; height: 24px; spacing: root.batch ? 8px : 12px;
+        visible: !root.simplified || root.pages > 1;
+        if root.batch && !root.simplified: CompactButton {
             width: 90px; enabled: root.count > 0;
             text: root.count > 0 && root.selected-count == root.count
                 ? GalleryStrings.tr("取消全选", "Deselect all", "Снять выбор")
@@ -291,20 +304,28 @@ export component GalleryView inherits Rectangle {
         Rectangle {
             horizontal-stretch: 1; min-width: 0px;
             Text {
+                visible: !root.simplified;
                 y: 0px; width: parent.width; height: root.batch && root.hidden-selected > 0 ? 13px : parent.height;
                 text: root.batch ? GalleryStrings.tr("已选 ", "Selected ", "Выбрано ") + root.selected-count : root.connected-count + " / " + root.count + GalleryStrings.tr(" 台已连接", " connected", " подключено");
                 color: #62666d; vertical-alignment: center; font-size: 12px; overflow: elide;
             }
-            if root.batch && root.hidden-selected > 0: Text {
+            if root.batch && !root.simplified && root.hidden-selected > 0: Text {
                 y: 14px; width: parent.width; height: 10px;
-                text: GalleryStrings.tr("跨页 ", "Other pages ", "Другие страницы ") + root.hidden-selected;
+                text: GalleryStrings.tr("跨页 ", "Other pages ", "Вне страницы ") + root.hidden-selected;
                 color: #80858d; font-size: 10px; overflow: elide;
             }
         }
-        if root.batch: HorizontalLayout {
-            width: 214px; spacing: 8px;
+        if root.batch && !root.simplified: HorizontalLayout {
+            width: 280px; spacing: 8px;
             CompactButton { width: 58px; enabled: root.selected-count > 0; text: GalleryStrings.tr("连接", "Connect", "Связь"); clicked => { root.action("connect", ""); } }
             CompactButton { width: 62px; enabled: root.selected-count > 0; text: GalleryStrings.tr("断开", "Close", "Отключить"); clicked => { root.confirm-action("disconnect", self.text); } }
+            CompactButton {
+                width: 58px; enabled: root.selected-audio-available;
+                text: root.selected-audio-muted
+                    ? GalleryStrings.tr("取消静音", "Unmute", "Со звуком")
+                    : GalleryStrings.tr("静音", "Mute", "Без звука");
+                clicked => { root.action(root.selected-audio-muted ? "unmute" : "mute", ""); }
+            }
             CompactButton { width: 78px; enabled: root.selected-count > 0; text: GalleryStrings.tr("分发文件", "Send file", "Файл"); clicked => { root.confirm-action("file", self.text); } }
         }
         HorizontalLayout {
diff --git a/apps/desktop/src/gui/ui/main_window.slint b/apps/desktop/src/gui/ui/main_window.slint
index b251ba4d..f1289ecf 100644
--- a/apps/desktop/src/gui/ui/main_window.slint
+++ b/apps/desktop/src/gui/ui/main_window.slint
@@ -2,6 +2,9 @@ import { GalleryStrings } from "device_strings.slint";
 import { DeviceCardActions, DeviceCardStyle } from "device_card_actions.slint";
 import { DeviceGroupDialog, DeviceGroupOption } from "device_group_dialog.slint";
 import { GalleryView, GalleryTile, GalleryRecentDevice, GalleryActionDevice } from "gallery_view.slint";
+import { GalleryNetworkDialog, GalleryNetworkDevice } from "gallery_network_dialog.slint";
+import { SettingsButton, SettingsSelect, SettingsGroup, SettingsRow, SettingsToggleRow } from "settings_controls.slint";
+import { GallerySettings } from "gallery_settings.slint";
 import { GroupFilter } from "group_filter.slint";
 import { LineEdit, ScrollView } from "std-widgets.slint";
 import { AnnouncementItem, MessagePanel, MessageStrings } from "message_panel.slint";
@@ -303,6 +306,22 @@ export component MainWindow inherits Window {
     default-font-size: ImGuiFontStyle.base;
 
     in-out property <bool> gallery-mode: false;
+    in-out property <bool> gallery-simplified: false;
+    changed gallery-simplified => {
+        root.reset-gallery-transient();
+        root.gallery-action("view-mode", "");
+        focus-sink.focus();
+    }
+    in-out property <bool> gallery-network-open: false;
+    in property <int> gallery-resolution-index: 0;
+    in property <int> gallery-frame-rate-index: 0;
+    in-out property <int> gallery-resolution-draft: 0;
+    in-out property <int> gallery-frame-rate-draft: 0;
+    in property <string> gallery-settings-error;
+    in property <[GalleryNetworkDevice]> gallery-network-devices;
+    changed gallery-network-open => {
+        if root.gallery-network-open { root.menu-open = false; root.gallery-action("network-open", ""); }
+    }
     in property <bool> gallery-fullscreen: false;
     in property <bool> gallery-transitioning: false;
     in property <bool> gallery-content-visible: true;
@@ -330,6 +349,8 @@ export component MainWindow inherits Window {
     in property <int> gallery-count: 0;
     in property <int> gallery-connected: 0;
     in property <int> gallery-selected: 0;
+    in property <bool> gallery-selected-audio-available: false;
+    in property <bool> gallery-selected-audio-muted: false;
     in property <int> gallery-hidden-selected: 0;
     in property <string> gallery-notice;
     in property <[GalleryActionDevice]> gallery-selected-devices;
@@ -366,7 +387,7 @@ export component MainWindow inherits Window {
         root.device-group-open = true;
     }
 
-    public function reset-gallery-transient() { gallery.reset-transient(); root.menu-open = false; }
+    public function reset-gallery-transient() { gallery.reset-transient(); root.menu-open = false; root.gallery-network-open = false; }
     in property <bool> custom-titlebar: false;
     in property <bool> wayland-titlebar: false;
     in property <bool> window-active: true;
@@ -503,6 +524,7 @@ export component MainWindow inherits Window {
 
     private property <bool> menu-open: false;
     in-out property <bool> settings-open: false;
+    in-out property <int> settings-tab: 0;
     private property <length> settings-scroll-y: 0px;
     in-out property <bool> self-host-settings-open: false;
     changed self-host-settings-open => {
@@ -544,7 +566,13 @@ export component MainWindow inherits Window {
     changed permission-dialog-open => { if root.permission-dialog-open { root.gallery-action("release", ""); } }
     changed settings-open => {
         if root.settings-open {
+            root.settings-tab = 0;
             root.settings-scroll-y = 0px;
+            root.menu-open = false;
+            root.gallery-network-open = false;
+            root.gallery-resolution-draft = root.gallery-resolution-index;
+            root.gallery-frame-rate-draft = root.gallery-frame-rate-index;
+            root.gallery-action("settings-open", "");
             focus-sink.focus();
         }
     }
@@ -780,6 +808,10 @@ export component MainWindow inherits Window {
                     if event.text == Key.Escape { root.messages-open = false; }
                     return accept;
                 }
+                if root.settings-open && !root.self-host-settings-open {
+                    if event.text == Key.Escape { root.cancel-settings(); root.settings-open = false; }
+                    return accept;
+                }
                 return reject;
             }
         }
@@ -915,6 +947,20 @@ export component MainWindow inherits Window {
                 }
             }
         }
+        if root.gallery-mode: CompactButton {
+            x: menu-button.x - 87px - 16px - 94px - 8px - self.width;
+            y: mode-switch.y; width: 94px; height: mode-switch.height;
+            primary: root.gallery-simplified;
+            text: root.gallery-simplified ? GalleryStrings.tr("退出精简", "Exit compact", "Обычный вид")
+                : GalleryStrings.tr("精简模式", "Compact", "Компактно");
+            clicked => { root.gallery-simplified = !root.gallery-simplified; }
+        }
+        if root.gallery-mode: CompactButton {
+            x: menu-button.x - 87px - 16px - self.width;
+            y: mode-switch.y; width: 94px; height: mode-switch.height;
+            text: GalleryStrings.tr("网络状态", "Network", "Сеть");
+            clicked => { root.gallery-network-open = true; }
+        }
         if root.gallery-mode: CompactButton {
             x: menu-button.x - self.width - 8px;
             y: mode-switch.y;
@@ -1327,8 +1373,10 @@ export component MainWindow inherits Window {
 
         }
         gallery := GalleryView {
-            y: root.content-header-height; width: parent.width; height: parent.height - self.y - 24px;
+            y: root.content-header-height; width: parent.width;
+            height: parent.height - self.y - (root.gallery-simplified ? 0px : 24px);
             visible: root.gallery-mode;
+            simplified: root.gallery-simplified;
             controlling: root.gallery-controlling;
             pointer-input(button, kind, x, y) => { root.gallery-pointer(button, kind, x, y); }
             scroll-input(dx, dy, x, y) => { root.gallery-scroll(dx, dy, x, y); }
@@ -1338,6 +1386,8 @@ export component MainWindow inherits Window {
             columns: root.gallery-columns; rows: root.gallery-rows;
             page: root.gallery-page; pages: root.gallery-pages; count: root.gallery-count;
             connected-count: root.gallery-connected; selected-count: root.gallery-selected;
+            selected-audio-available: root.gallery-selected-audio-available;
+            selected-audio-muted: root.gallery-selected-audio-muted;
             hidden-selected: root.gallery-hidden-selected; notice: root.gallery-notice;
             selected-devices: root.gallery-selected-devices;
             focused: root.gallery-focused; batch <=> root.gallery-batch; adding <=> root.gallery-adding;
@@ -1356,6 +1406,7 @@ export component MainWindow inherits Window {
         }
         // Status bar.
         Rectangle {
+            visible: !root.gallery-mode || !root.gallery-simplified;
             y: parent.height - 24px;
             height: 24px;
             background: #fafbfc;
@@ -1930,172 +1981,176 @@ export component MainWindow inherits Window {
         }
     }
 
-    // Settings modal.
+    // Both tabs share one draft and the same save/cancel actions.
     if root.settings-open: Rectangle {
-        background: transparent;
+        background: #15223850;
         z: 45;
         TouchArea { clicked => { focus-sink.focus(); } }
         DialogSurface {
-            x: root.compact-language ? 219px : 190px;
-            y: 60px;
-            width: root.compact-language ? 202px : 269px;
-            height: 330px;
-            border-radius: 7px;
-
-            Rectangle {
-                x: 0px;
-                y: 0px;
-                width: parent.width;
-                height: 21px;
-                background: #d3d3d3;
-                border-radius: 7px;
-                z: 5;
-                Rectangle { y: parent.height - 7px; height: 7px; background: #d3d3d3; }
-                Text { x: 6px; text: UiStrings.settings; font-size: ImGuiFontStyle.base; font-weight: 600; color: #202124; vertical-alignment: center; }
+            x: (parent.width - self.width) / 2;
+            y: (parent.height - self.height) / 2;
+            width: min(400px, parent.width - 40px); height: 446px;
+            background: #f8fafc; border-radius: 14px; border-color: #e1e7ef;
+            drop-shadow-color: #14294424; drop-shadow-blur: 24px; drop-shadow-offset-y: 8px;
+            TouchArea { clicked => { focus-sink.focus(); } }
+            Text {
+                x: 18px; y: 18px; width: parent.width - 80px; height: 27px;
+                text: UiStrings.settings; font-size: 20px; font-weight: 600; color: #22324a;
             }
-
-            settings-scroll := ScrollView {
-                x: 0px;
-                y: 21px;
-                width: parent.width;
-                height: 265px;
-                viewport-y <=> root.settings-scroll-y;
-
-                settings-content := VerticalLayout {
-                    // Reserve space for the overlaid vertical scrollbar.
-                    width: settings-scroll.width;
-                    padding-top: 8px;
-                    padding-bottom: 8px;
-                    spacing: 0px;
-
-                    Rectangle {
-                        height: 30px;
-                        Text { x: 8px; y: 3px; width: root.compact-language ? 94px : 162px; height: 24px; text: UiStrings.language; font-size: ImGuiFontStyle.body; overflow: elide; vertical-alignment: center; }
-                        CompactComboBox { x: root.compact-language ? 106px : 174px; y: 2px; model: ["中文", "English", "Русский"]; current-index <=> root.language-index; }
+            SettingsButton {
+                x: parent.width - 90px; y: 18px; width: 76px; height: 28px; quiet: true;
+                text: GalleryStrings.tr("关闭", "Close", "Закрыть");
+                clicked => { root.cancel-settings(); root.settings-open = false; root.self-host-settings-open = false; }
+            }
+            Rectangle {
+                x: 18px; y: 56px; width: parent.width - 36px; height: 40px;
+                background: #eaf0f6; border-radius: 9px;
+                Rectangle {
+                    x: 4px + root.settings-tab * (parent.width - 8px) / 2;
+                    y: 4px; width: (parent.width - 8px) / 2; height: parent.height - 8px;
+                    background: white; border-radius: 6px;
+                    drop-shadow-color: #1e3e6520; drop-shadow-blur: 3px; drop-shadow-offset-y: 1px;
+                    animate x { duration: 140ms; easing: ease-out; }
+                }
+                for label[index] in [GalleryStrings.tr("常规", "General", "Общие"), GalleryStrings.tr("桌面墙", "DeskHub", "DeskHub")]: Rectangle {
+                    x: 4px + index * (parent.width - 8px) / 2;
+                    y: 4px; width: (parent.width - 8px) / 2; height: parent.height - 8px;
+                    border-radius: 6px;
+                    background: tab-touch.has-hover && root.settings-tab != index ? #e1e8f1 : transparent;
+                    accessible-role: button; accessible-label: label;
+                    accessible-action-default => { tab-touch.clicked(); }
+                    Text {
+                        text: label; font-size: 12px; font-weight: root.settings-tab == index ? 600 : 400;
+                        color: root.settings-tab == index ? #2e70cf : #718096;
+                        horizontal-alignment: center; vertical-alignment: center;
                     }
-                    if root.capture-method-visible: Rectangle {
-                        height: 30px;
-                        Text { x: 8px; y: 3px; width: root.compact-language ? 94px : 162px; height: 24px; text: UiStrings.capture-method; font-size: ImGuiFontStyle.body; overflow: elide; vertical-alignment: center; }
-                        CompactComboBox { x: root.compact-language ? 106px : 174px; y: 2px; enabled: !root.settings-session-active; model: [UiStrings.capture-method-auto, "DXGI", "WGC", "GDI"]; current-index <=> root.capture-method-index; }
-                    }
-                    Rectangle {
-                        height: 30px;
-                        Text { x: 8px; y: 3px; width: root.compact-language ? 94px : 162px; height: 24px; text: UiStrings.codec; font-size: ImGuiFontStyle.body; overflow: elide; vertical-alignment: center; }
-                        CompactComboBox { x: root.compact-language ? 106px : 174px; y: 2px; enabled: !root.settings-session-active; model: [UiStrings.codec-h264, UiStrings.codec-av1]; current-index <=> root.codec-index; }
-                    }
-                    Rectangle {
-                        height: 30px;
-                        Text { x: 8px; y: 3px; width: root.compact-language ? 145px : 212px; height: 24px; text: UiStrings.hardware-codec; color: root.hardware-codec-available ? #202124 : #8b8f95; font-size: ImGuiFontStyle.body; overflow: elide; vertical-alignment: center; }
-                        ImGuiCheckBox { x: root.compact-language ? 157px : 224px; y: 3px; checked <=> root.hardware-codec-enabled; enabled: root.hardware-codec-available && !root.settings-session-active; }
-                    }
-                    Rectangle {
-                        height: 30px;
-                        Text { x: 8px; y: 3px; width: root.compact-language ? 145px : 212px; height: 24px; text: UiStrings.turn-relay; font-size: ImGuiFontStyle.body; overflow: elide; vertical-alignment: center; }
-                        ImGuiCheckBox { x: root.compact-language ? 157px : 224px; y: 3px; checked <=> root.turn-enabled; enabled: !root.settings-session-active; }
-                    }
-                    Rectangle {
-                        height: 30px;
-                        Text { x: 8px; y: 3px; width: root.compact-language ? 145px : 212px; height: 24px; text: UiStrings.force-relay; color: root.turn-enabled ? #202124 : #8b8f95; font-size: ImGuiFontStyle.body; overflow: elide; vertical-alignment: center; }
-                        ImGuiCheckBox { x: root.compact-language ? 157px : 224px; y: 3px; checked <=> root.force-relay-enabled; enabled: root.turn-enabled && !root.settings-session-active; }
-                    }
-                    Rectangle {
-                        height: 30px;
-                        Text { x: 8px; y: 3px; width: root.compact-language ? 145px : 212px; height: 24px; text: UiStrings.save-remote-previews; font-size: ImGuiFontStyle.body; overflow: elide; vertical-alignment: center; }
-                        ImGuiCheckBox { x: root.compact-language ? 157px : 224px; y: 3px; checked <=> root.save-remote-previews; }
-                    }
-                    Rectangle {
-                        height: 30px;
-                        Text { x: 8px; y: 3px; width: root.compact-language ? 145px : 212px; height: 24px; text: UiStrings.privacy-on-connect; color: root.privacy-setting-available ? #202124 : #8b8f95; font-size: ImGuiFontStyle.body; overflow: elide; vertical-alignment: center; }
-                        ImGuiCheckBox { x: root.compact-language ? 157px : 224px; y: 3px; checked <=> root.privacy-on-connect-enabled; enabled: root.privacy-setting-available; }
-                    }
-                    Rectangle {
-                        height: 30px;
-                        CompactButton { x: 8px; y: 3px; width: root.compact-language ? 70px : 206px; text: UiStrings.self-hosted; enabled: !root.settings-session-active; clicked => { root.self-host-settings-open = true; } }
-                        ImGuiCheckBox { x: root.compact-language ? 157px : 224px; y: 3px; checked <=> root.self-hosted-enabled; enabled: !root.settings-session-active; }
-                    }
-                    Rectangle {
-                        height: 30px;
-                        Text { x: 8px; y: 3px; width: root.compact-language ? 145px : 212px; height: 24px; text: UiStrings.autostart; font-size: ImGuiFontStyle.body; overflow: elide; vertical-alignment: center; }
-                        ImGuiCheckBox { x: root.compact-language ? 157px : 224px; y: 3px; checked <=> root.autostart-enabled; enabled: !root.settings-session-active; }
-                    }
-                    Rectangle {
-                        height: 30px;
-                        Text { x: 8px; y: 3px; width: root.compact-language ? 145px : 212px; height: 24px; text: UiStrings.daemon; font-size: ImGuiFontStyle.body; overflow: elide; vertical-alignment: center; }
-                        ImGuiCheckBox { x: root.compact-language ? 157px : 224px; y: 3px; checked <=> root.daemon-enabled; enabled: !root.settings-session-active; }
-                    }
-                    Rectangle {
-                        height: 30px;
-                        Text { x: 8px; y: 3px; width: root.compact-language ? 94px : 154px; height: 24px; text: UiStrings.file-save-path; font-size: ImGuiFontStyle.body; overflow: elide; vertical-alignment: center; }
-                        CompactButton { x: root.compact-language ? 106px : 166px; y: 3px; width: root.compact-language ? 73px : 80px; text: root.file-save-path == "" ? UiStrings.default-desktop : root.file-save-path; enabled: !root.settings-session-active; clicked => { root.browse-save-path(); } }
+                    tab-touch := TouchArea {
+                        mouse-cursor: pointer;
+                        clicked => { root.settings-tab = index; focus-sink.focus(); }
                     }
                 }
             }
-
-            Rectangle { x: 7px; y: 286px; width: parent.width - 14px; height: 1px; background: ImGuiLineStyle.separator; }
-            CompactButton { x: root.compact-language ? 63px : 89px; y: 297px; primary: true; text: UiStrings.ok; clicked => { if root.save-settings() { root.settings-open = false; root.self-host-settings-open = false; } } }
-            CompactButton { x: root.compact-language ? 104px : 130px; y: 297px; width: root.compact-language ? 34px : 56px; text: UiStrings.cancel; clicked => { root.cancel-settings(); root.settings-open = false; root.self-host-settings-open = false; } }
+            if root.settings-tab == 0: settings-scroll := ScrollView {
+                x: 18px; y: 108px; width: parent.width - 28px; height: 272px;
+                viewport-y <=> root.settings-scroll-y;
+                VerticalLayout {
+                    width: settings-scroll.width - 12px;
+                    spacing: 14px; padding-bottom: 4px;
+                    SettingsGroup {
+                        title: GalleryStrings.tr("界面", "Interface", "Интерфейс"); rows: 1;
+                        SettingsRow {
+                            label: UiStrings.language; divider: false;
+                            SettingsSelect { x: parent.width - 116px; y: 4px; width: 104px; model: ["中文", "English", "Русский"]; current-index <=> root.language-index; }
+                        }
+                    }
+                    SettingsGroup {
+                        title: GalleryStrings.tr("视频", "Video", "Видео");
+                        rows: root.capture-method-visible ? 3 : 2;
+                        if root.capture-method-visible: SettingsRow {
+                            label: UiStrings.capture-method; enabled: !root.settings-session-active;
+                            SettingsSelect { x: parent.width - 116px; y: 4px; width: 104px; enabled: !root.settings-session-active; model: [UiStrings.capture-method-auto, "DXGI", "WGC", "GDI"]; current-index <=> root.capture-method-index; }
+                        }
+                        SettingsRow {
+                            label: UiStrings.codec; enabled: !root.settings-session-active;
+                            SettingsSelect { x: parent.width - 116px; y: 4px; width: 104px; enabled: !root.settings-session-active; model: [UiStrings.codec-h264, UiStrings.codec-av1]; current-index <=> root.codec-index; }
+                        }
+                        SettingsToggleRow { label: UiStrings.hardware-codec; checked <=> root.hardware-codec-enabled; enabled: root.hardware-codec-available && !root.settings-session-active; divider: false; }
+                    }
+                    SettingsGroup {
+                        title: GalleryStrings.tr("网络连接", "Network", "Сеть"); rows: 3;
+                        SettingsToggleRow { label: UiStrings.turn-relay; checked <=> root.turn-enabled; enabled: !root.settings-session-active; }
+                        SettingsToggleRow { label: UiStrings.force-relay; checked <=> root.force-relay-enabled; enabled: root.turn-enabled && !root.settings-session-active; }
+                        SettingsToggleRow {
+                            checked <=> root.self-hosted-enabled; enabled: !root.settings-session-active; divider: false;
+                            SettingsButton { x: 0px; y: 2px; width: parent.width - 60px; height: 32px; quiet: true; align-left: true; text: UiStrings.self-hosted; enabled: !root.settings-session-active; clicked => { root.self-host-settings-open = true; } }
+                        }
+                    }
+                    SettingsGroup {
+                        title: GalleryStrings.tr("隐私保护", "Privacy", "Приватность"); rows: 1;
+                        SettingsToggleRow { label: UiStrings.privacy-on-connect; checked <=> root.privacy-on-connect-enabled; enabled: root.privacy-setting-available; divider: false; }
+                    }
+                    SettingsGroup {
+                        title: GalleryStrings.tr("本地存储", "Local storage", "Локальное хранение"); rows: 2;
+                        SettingsToggleRow { label: UiStrings.save-remote-previews; checked <=> root.save-remote-previews; }
+                        SettingsRow {
+                            label: UiStrings.file-save-path; enabled: !root.settings-session-active; divider: false;
+                            SettingsButton { x: parent.width - 116px; y: 4px; width: 104px; height: 28px; text: root.file-save-path == "" ? UiStrings.default-desktop : root.file-save-path; enabled: !root.settings-session-active; clicked => { root.browse-save-path(); } }
+                        }
+                    }
+                    SettingsGroup {
+                        title: GalleryStrings.tr("启动与后台", "Startup & background", "Запуск и фоновая работа"); rows: 2;
+                        SettingsToggleRow { label: UiStrings.autostart; checked <=> root.autostart-enabled; enabled: !root.settings-session-active; }
+                        SettingsToggleRow { label: UiStrings.daemon; checked <=> root.daemon-enabled; enabled: !root.settings-session-active; divider: false; }
+                    }
+                }
+            }
+            if root.settings-tab == 1: GallerySettings {
+                x: 18px; y: 108px; width: parent.width - 36px; height: 272px;
+                resolution-index <=> root.gallery-resolution-draft;
+                frame-rate-index <=> root.gallery-frame-rate-draft;
+                error: root.gallery-settings-error;
+            }
+            Rectangle { x: 18px; y: 382px; width: parent.width - 36px; height: 1px; background: #e6ebf2; }
+            HorizontalLayout {
+                x: 18px; y: 396px; width: parent.width - 36px; height: 32px; spacing: 10px;
+                if root.settings-tab == 1: SettingsButton {
+                    width: 110px; quiet: true;
+                    text: GalleryStrings.tr("恢复默认", "Reset defaults", "По умолчанию");
+                    clicked => { root.gallery-resolution-draft = 0; root.gallery-frame-rate-draft = 0; }
+                }
+                Rectangle { horizontal-stretch: 1; }
+                SettingsButton {
+                    width: 80px; text: UiStrings.cancel;
+                    clicked => { root.cancel-settings(); root.settings-open = false; root.self-host-settings-open = false; }
+                }
+                SettingsButton {
+                    width: 92px; primary: true;
+                    text: GalleryStrings.tr("保存", "Save", "Сохранить");
+                    clicked => { if root.save-settings() { root.settings-open = false; root.self-host-settings-open = false; } }
+                }
+            }
         }
     }
 
     if root.self-host-settings-open: Rectangle {
-        background: transparent;
+        background: #15223835;
         z: 49;
         TouchArea { clicked => { focus-sink.focus(); } }
         DialogSurface {
-            x: root.compact-language ? 190px : 140px;
-            y: 105px;
-            width: root.compact-language ? 260px : 360px;
-            height: root.self-host-settings-error == "" ? 138px : 202px;
-            border-radius: 7px;
-
-            Rectangle {
-                x: 0px;
-                y: 0px;
-                width: parent.width;
-                height: 21px;
-                background: #d3d3d3;
-                border-radius: 7px;
-                z: 5;
-                Rectangle { y: parent.height - 7px; height: 7px; background: #d3d3d3; }
-                Text { x: 6px; text: UiStrings.self-hosted-settings; font-size: ImGuiFontStyle.base; font-weight: 600; color: #202124; vertical-alignment: center; }
+            x: (parent.width - self.width) / 2;
+            y: (parent.height - self.height) / 2;
+            width: 360px; height: root.self-host-settings-error == "" ? 266px : 322px;
+            border-radius: 12px; border-color: #e1e7ef; background: #f8fafc;
+            drop-shadow-color: #14294424; drop-shadow-blur: 18px; drop-shadow-offset-y: 6px;
+            TouchArea { clicked => { focus-sink.focus(); } }
+            Text {
+                x: 18px; y: 18px; width: parent.width - 36px; height: 24px;
+                text: UiStrings.self-hosted-settings; font-size: 16px; font-weight: 600; color: #22324a;
             }
-            Text { x: 8px; y: 31px; width: root.compact-language ? 88px : 165px; height: 24px; text: UiStrings.server-host; font-size: ImGuiFontStyle.body; overflow: elide; vertical-alignment: center; }
+            Text { x: 18px; y: 56px; width: parent.width - 36px; height: 20px; text: UiStrings.server-host; color: #34445a; font-size: 12px; overflow: elide; vertical-alignment: center; }
             Rectangle {
-                x: root.compact-language ? 100px : 173px;
-                y: 30px;
-                width: root.compact-language ? 152px : 179px;
-                height: 24px;
-                background: white;
-                border-width: 1px;
-                border-color: ImGuiLineStyle.border;
-                border-radius: 4px;
-                LineEdit { x: 1px; y: 1.5px; width: parent.width - 2px; height: parent.height - 2px; text <=> root.server-host; input-type: InputType.text; font-size: ImGuiFontStyle.body; }
+                x: 18px; y: 80px; width: parent.width - 36px; height: 30px;
+                background: white; border-width: 1px; border-color: #dfe6ef; border-radius: 6px;
+                LineEdit { x: 1px; y: 2px; width: parent.width - 2px; height: parent.height - 4px; text <=> root.server-host; input-type: InputType.text; font-size: 12px; }
                 LineEditFocusUnderlineMask { x: 5px; y: parent.height - 3px; width: parent.width - 10px; }
             }
-            Text { x: 8px; y: 61px; width: root.compact-language ? 88px : 165px; height: 24px; text: UiStrings.server-port; font-size: ImGuiFontStyle.body; overflow: elide; vertical-alignment: center; }
+            Text { x: 18px; y: 120px; width: parent.width - 36px; height: 20px; text: UiStrings.server-port; color: #34445a; font-size: 12px; overflow: elide; vertical-alignment: center; }
             Rectangle {
-                x: root.compact-language ? 100px : 173px;
-                y: 60px;
-                width: root.compact-language ? 152px : 179px;
-                height: 24px;
-                background: white;
-                border-width: 1px;
-                border-color: ImGuiLineStyle.border;
-                border-radius: 4px;
-                LineEdit { x: 1px; y: 1.5px; width: parent.width - 2px; height: parent.height - 2px; text <=> root.server-port; input-type: InputType.number; font-size: ImGuiFontStyle.body; }
+                x: 18px; y: 144px; width: parent.width - 36px; height: 30px;
+                background: white; border-width: 1px; border-color: #dfe6ef; border-radius: 6px;
+                LineEdit { x: 1px; y: 2px; width: parent.width - 2px; height: parent.height - 4px; text <=> root.server-port; input-type: InputType.number; font-size: 12px; }
                 LineEditFocusUnderlineMask { x: 5px; y: parent.height - 3px; width: parent.width - 10px; }
             }
             if root.self-host-settings-error != "": Text {
-                x: 8px; y: 89px; width: parent.width - 16px; height: 64px;
-                text: root.self-host-settings-error; color: #b3261e;
-                font-size: ImGuiFontStyle.body; wrap: word-wrap;
+                x: 18px; y: 186px; width: parent.width - 36px; height: 48px;
+                text: root.self-host-settings-error; color: #c53e3e; font-size: 11px; wrap: word-wrap;
             }
-            CompactButton { x: root.compact-language ? 93px : 135px; y: parent.height - 38px; primary: true; text: UiStrings.ok; clicked => { if root.save-self-hosted-settings() { root.self-host-settings-open = false; } } }
-            CompactButton { x: root.compact-language ? 134px : 176px; y: parent.height - 38px; width: root.compact-language ? 34px : 56px; text: UiStrings.cancel; clicked => { root.cancel-self-hosted-settings(); root.self-host-settings-open = false; } }
+            Rectangle { x: 18px; y: parent.height - 66px; width: parent.width - 36px; height: 1px; background: #e6ebf2; }
+            SettingsButton { x: parent.width - 114px; y: parent.height - 50px; width: 92px; primary: true; text: UiStrings.ok; clicked => { if root.save-self-hosted-settings() { root.self-host-settings-open = false; } } }
+            SettingsButton { x: parent.width - 204px; y: parent.height - 50px; width: 80px; text: UiStrings.cancel; clicked => { root.cancel-self-hosted-settings(); root.self-host-settings-open = false; } }
         }
     }
 
-    // About modal.
     if root.about-open: Rectangle {
         background: transparent;
         z: 46;
@@ -2455,6 +2510,14 @@ export component MainWindow inherits Window {
     }
     }
 
+    if root.gallery-mode && root.gallery-network-open: GalleryNetworkDialog {
+        x: 0px; y: root.titlebar-height;
+        width: root.width; height: root.height - self.y;
+        z: 100;
+        devices: root.gallery-network-devices;
+        close => { root.gallery-network-open = false; focus-sink.focus(); }
+    }
+
     // Ignore clicks against moving cards and duplicate fullscreen requests.
     if root.gallery-transitioning: TouchArea {
         x: 0px; y: root.titlebar-height;
diff --git a/apps/desktop/src/gui/ui/settings_controls.slint b/apps/desktop/src/gui/ui/settings_controls.slint
new file mode 100644
index 00000000..f8a5249d
--- /dev/null
+++ b/apps/desktop/src/gui/ui/settings_controls.slint
@@ -0,0 +1,73 @@
+import { CompactComboBox, ToggleSwitch } from "common.slint";
+
+// Shared visual treatment for the global settings pages.
+export component SettingsButton inherits Rectangle {
+    in property <string> text;
+    in property <bool> primary: false;
+    in property <bool> quiet: false;
+    in property <bool> align-left: false;
+    in property <bool> enabled: true;
+    callback clicked();
+    width: 88px; height: 32px; border-radius: 7px;
+    background: !root.enabled ? #f0f3f7
+        : root.primary ? (touch.pressed ? #1e4fa3 : touch.has-hover ? #2866c9 : #3275dc)
+        : touch.pressed ? #e9eef5 : touch.has-hover ? #f0f4fa : root.quiet ? transparent : white;
+    border-width: root.quiet || root.primary ? 0px : 1px;
+    border-color: #dce3ec;
+    accessible-role: button; accessible-label: root.text;
+    accessible-action-default => { if root.enabled { root.clicked(); } }
+    Text {
+        x: 12px; width: parent.width - 24px;
+        text: root.text; font-size: 12px; font-weight: root.primary ? 600 : 400;
+        color: !root.enabled ? #98a2b3 : root.primary ? white : root.quiet ? #65758b : #3c4d63;
+        horizontal-alignment: root.align-left ? left : center; vertical-alignment: center; overflow: elide;
+    }
+    touch := TouchArea { enabled: root.enabled; mouse-cursor: pointer; clicked => { root.clicked(); } }
+}
+
+export component SettingsSelect inherits CompactComboBox {
+    subtle: true;
+    show-arrow: false;
+    height: 28px;
+}
+
+export component SettingsGroup inherits Rectangle {
+    in property <string> title;
+    in property <int> rows: 1;
+    height: 24px + root.rows * 36px;
+    Text {
+        x: 2px; y: 0px; width: parent.width - 4px; height: 18px; text: root.title;
+        font-size: 11px; font-weight: 600; color: #718096; vertical-alignment: center;
+    }
+    Rectangle {
+        y: 24px; width: parent.width; height: parent.height - self.y;
+        background: white; border-radius: 9px; border-color: #e5eaf1; border-width: 1px;
+        VerticalLayout { padding: 0px; spacing: 0px; @children }
+    }
+}
+
+export component SettingsRow inherits Rectangle {
+    in property <string> label;
+    in property <bool> enabled: true;
+    in property <bool> divider: true;
+    in property <length> label-reserve: 128px;
+    height: 36px;
+    Text {
+        x: 12px; width: parent.width - root.label-reserve; height: parent.height;
+        text: root.label; color: root.enabled ? #34445a : #9ba5b3;
+        font-size: 12px; overflow: elide; vertical-alignment: center;
+    }
+    if root.divider: Rectangle {
+        x: 12px; y: parent.height - 1px; width: parent.width - 24px; height: 1px; background: #eff2f6;
+    }
+    @children
+}
+
+export component SettingsToggleRow inherits SettingsRow {
+    in-out property <bool> checked;
+    label-reserve: 64px;
+    ToggleSwitch {
+        x: parent.width - self.width - 12px; y: (parent.height - self.height) / 2;
+        checked <=> root.checked; enabled: root.enabled;
+    }
+}
diff --git a/deps/submodules/minirtc b/deps/submodules/minirtc
index f597bbe7..851eb2ed 160000
--- a/deps/submodules/minirtc
+++ b/deps/submodules/minirtc
@@ -1 +1 @@
-Subproject commit f597bbe7997bb2f058f74ff9c844d8a93cf9249f
+Subproject commit 851eb2ed1f121c46981e7b22d79f59d1261a682e
diff --git a/docs/deskhub.md b/docs/deskhub.md
index 2d814bec..040dd602 100644
--- a/docs/deskhub.md
+++ b/docs/deskhub.md
@@ -18,20 +18,32 @@
 - 近期连接的设备提示浮窗显示所属分组；多个分组并列显示并自动换行，没有分组时显示“未分组”。分组变更后自动刷新。
 - “近期连接”标题行右侧可按“全部设备”、未分组或已有分组筛选；一个设备可出现在它所属的多个分组中。筛选与桌面墙当前分组独立，不改变历史记录、在线状态订阅或桌面墙成员。分组修改后自动更新结果；当前分组被清空删除时回到全部设备。
 - 网格随窗口大小增加行列，紧凑窗口为 3 × 2；翻页不关闭连接。分组内顺序不会按在线状态自动重排。
+- 顶部“精简模式”切换为仅画面的设备卡片，隐藏名称、在线状态、状态文字和悬停操作条，同时收起设备管理工具栏、连接计数与底部服务器状态栏；画面完整等比显示，不裁切。顶部保留“退出精简”、网络状态、全屏及菜单入口，多页时保留分页。点击图片仍可展开查看和接管操控，返回后保持精简模式；模式切换会释放操控、退出批量选择并返回网格，不改变连接、分组和设备顺序。
+- 菜单中的全局“设置”顶部并排提供“常规”和“桌面墙”两个选项卡；“桌面墙”可统一配置桌面墙设备的传输分辨率上限和帧率，在连接页面以及桌面墙普通、精简、展开和全屏视图中均可打开。切换选项卡保留未保存修改，底部统一保存或取消。分辨率支持自动、320 × 180、640 × 360、1280 × 720、1920 × 1080、2560 × 1440、3840 × 2160和原始分辨率；固定上限适用于缩略图和展开画面，保持比例且不放大源画面。帧率支持跟随设备设置、15、30、60 FPS。保存后立即更新当前桌面墙会话，也用于后续桌面墙连接，不影响普通连接，跨分组和分页生效；取消不应用修改，恢复默认需保存后生效。配置保存在本地，重启后保留；保存失败时保留面板和输入。打开设置会释放远程操控。
+- 顶部“网络状态”按钮打开当前已建立连接的设备列表，不受桌面墙分组和分页限制；离线、未连接和连接中的设备不列入，断开后自动移除。列表显示设备名称、ID、直连／中继、实际协商的 SRTP 加密状态、往返延迟（RTT）、控制端接收与发送速率、视频丢包率、实际接收分辨率与帧率，打开期间每秒刷新。加密状态紧随连接方式显示为“已加密／未加密”，尚无统计或报告超过 3 秒未更新时显示“待确认”。分辨率与帧率在解码交付时统计，墙内预览和后台会话均可用；尚未收到画面时显示“—”，画面停止更新超过 1 秒时帧率显示 0 FPS。网络数值尚无统计或报告超过 3 秒未更新时显示“—”。可通过关闭按钮、Esc 或点击列表外关闭；打开列表会释放远程操控。
 - 点卡片进入只读放大视图，点“接管操控”才开始发送键鼠。点“释放操控”或按 Ctrl/⌘ + Shift + Esc 可以释放。切换设备、翻页、打开本地操作面板、切换模式及窗口失焦也会释放。
+- 桌面墙连接默认静音，包含新建连接、重连、复用已有连接、添加或导入已有会话，以及切入桌面墙时已有的连接。展开、全屏或接管操控不会自动开启声音；需要声音时，可通过批量“取消静音”或在独立串流窗口主动开启。两个入口共用同一静音状态，主动开启的声音在桌面墙可见时播放，翻页、展开及释放操控保留声音设置；每台设备使用独立音频流同时播放，静音一台不会清空其他设备的声音。新版本对端按会话关闭音频订阅；旧版本发送的音频由控制端丢弃，不通过停止对端的全局声音采集影响其他控制端。
 - 放大视图使用一行设备操作栏，只保留返回、设备名称、状态和接管／释放操控按钮；紧凑窗口的设备缩略图位于下方，宽窗口移到右侧。缩略图显示设备名、在线状态和当前设备标记，缺少画面或画面停滞时有状态占位；滚动条单独留出空间。调整尺寸后当前设备仍在列表中，选中时自动滚入可见区域。主预览和缩略图均完整等比显示，鼠标坐标按实际预览区域映射。
 - 在“近期连接”中点击已连接设备的卡片画面，可打开原有独立串流窗口，使用声音、显示器切换、隐私屏、文件传输等完整单会话工具。关闭墙内设备的独立窗口不会断开墙中的会话。
-- 批量选择复用固定底栏，设备卡片的位置和尺寸不变。底栏提供“全选”：选中当前筛选下的所有设备，跨页生效；全部选中后显示“取消全选”。翻页保留选择，切换分组清空选择；已选数量与跨页数量、连接／断开／分发文件及分页控件在同一底栏显示。断开和文件分发会先列出完整目标；提交后的操作目标不会跟随之后的选择变化。
+- 批量选择复用固定底栏，设备卡片的位置和尺寸不变。底栏提供“全选”：选中当前筛选下的所有设备，跨页生效；全部选中后显示“取消全选”。翻页保留选择，切换分组清空选择；已选数量与跨页数量、连接／断开／静音／分发文件及分页控件在同一底栏显示。声音按钮根据已选且已连接设备的状态切换：全部静音时显示“取消静音”，有设备开启声音时显示“静音”，无已连接设备时禁用。点击后统一设置所有已选的已连接设备，包含跨页选择，跳过未连接设备，保留当前选择。断开和文件分发会先列出完整目标；提交后的操作目标不会跟随之后的选择变化。
 
 ## 预览与兼容性
 
-桌面墙的所有已连接设备统一使用各自的交互画质、30／60 帧设置和降级策略。缩略图、放大查看、操控、翻页和隐藏窗口均不改变发送档位。新版两端通过 `supports_deskhub_preview` 同步订阅，视频按编码器协商的帧率发送，不再额外限帧；声音仍需明确开启。
+自动分辨率模式下，桌面墙发起或接管的会话在能力协商后默认请求最长边不超过 320 像素的画面。点卡片展开后，根据视频显示区域的实际物理像素（包含 HiDPI 缩放）请求分辨率；全屏、退出全屏和调整窗口大小后会重新计算，尺寸稳定 200 毫秒后更新订阅。返回网格、隐藏桌面墙或切换到其他设备后恢复缩略图尺寸。同一会话同时在独立串流窗口显示时，按两个可见视频区域中较大的尺寸请求，避免小预览降低大窗口的清晰度。选择固定或原始分辨率后使用对应上限；恢复自动后重新跟随视图。普通连接页发起且未加入桌面墙管理的会话保留原有分辨率行为。
 
-为兼容旧版控制端，被控端仍接受暂停和 1／8 帧订阅；这些低帧率请求使用保持分辨率策略，避免套用交互视频的帧率与关键帧时延预算而反复缩小画面。当前桌面墙不再发出这些请求。
+被控端按连接分别在编码前缩放，完整保留桌面比例，不放大超过源画面的尺寸，也不修改被控端屏幕的系统分辨率。请求的宽高是上限，画质和网络自适应仍可降低实际发送尺寸。默认跟随每个会话原有的 30／60 帧设置；指定帧率仅覆盖桌面墙订阅，不修改会话的画质或原有帧率偏好。声音仍需明确开启。
+
+15 帧订阅使用编码前发送节流和稳定的逐显示流时间预算，并采用保持分辨率策略，避免低帧率触发交互视频的画质降级。30／60 帧选项使用编码器自身的交互帧率控制。仅向声明 `supports_deskhub_fps15` 的对端发送 `fps=15`；缺少该能力的 v1／v2 对端使用原有 `fps=60, frame_rate=30` 格式回退到 30 FPS，未声明预览能力的更旧版本保持原行为。协议仍接受旧控制端的 1／8 帧请求，但设置界面不再提供这两个档位。
 
 预览在解码回调中随收到的画面生成有界缩略图，可见桌面墙随 UI 刷新显示最新帧。UI 不处理全分辨率转换，只保留当前可见设备的最新预览，超过 5 秒未更新会标记停帧。画面保持比例，以完整矩形显示；外层圆角卡片与画面之间保留内边距，不裁切桌面内容或画面边角。实际显示帧率受设备性能与网络状况影响。
 
-旧版被控端仍可连接，按其支持的交互视频策略发送。多设备同时发送交互视频会增加带宽和编解码负载。
+连接旧版被控端时，若仅声明 `supports_deskhub_preview`，控制端发送原有 v1 订阅；若未声明预览能力，则不发送该订阅，沿用其视频策略。旧控制端连接新版被控端时继续使用原分辨率；v1 订阅也会清除此前的尺寸限制。只有同时声明 `supports_deskhub_preview` 与 `supports_deskhub_resolution` 的被控端才会收到 v2 尺寸请求，旧版本不承诺发送端节省资源。
+
+### 协议与接口
+
+可靠控制通道的 `deskhub_preview` v2 保留 v1 的 `request_id`、`fps`、`quality`、`frame_rate`、`preference`、`audio` 字段，新增必填 `width`、`height` 整数，单位为物理像素。两个值均为 0 表示恢复源尺寸上限，否则两个值均须在 2～16384 之间；非法或缺失的值不应用。`deskhub_preview_status` 回传请求的协议版本、请求 ID 与 `accepted`。请求 ID 跳过 0，支持 32 位回绕，重复或过期请求不会覆盖新设置。断开会话清除订阅和 15 FPS 协商能力，再连接会重新发送当前需求。15 FPS 扩展通过可选能力 `supports_deskhub_fps15` 协商，沿用 v1／v2 的字段结构，使用 `fps=15, frame_rate=30`，在编码前将实际输入限制为 15 FPS。
+
+MiniRTC 新增 `UpdateVideoResolution(peer, remote_id, remote_id_size, width, height)` 接口，返回 0 表示已接受，-1 表示参数、连接或传输类型不支持。它为指定控制端的所有显示流设置独立尺寸上限，切换时丢弃旧设置尚未发出的编码结果，并请求新关键帧；底层自适应也以这个上限作为有效源尺寸。
 
 ## 批量操作
 
@@ -39,7 +51,7 @@
 
 批量操作仅在本次运行中执行，不提供任务列表、操作历史或重启后的恢复。成员资料与窗口状态保存在应用缓存目录的 `deskhub.json` 和 `deskhub.json.window` 中，不含设备密码和文件内容。
 
-`deskhub.json` 第 2 版分别保存分组记录和桌面墙设备 ID。第 1 版配置仍可读取，原有桌面墙成员、分组和顺序会保留；旧版数据未记录加入来源，因此不会自动移除已有成员。
+`deskhub.json` 第 2 版分别保存分组记录和桌面墙设备 ID，并通过可选的 `stream_settings` 保存分辨率预设及帧率。缺少或无效的设置使用自动分辨率和跟随设备帧率，不影响设备成员。已保存的 1／8 FPS 自动迁移为 15 FPS，保留原分辨率预设；原有 30／60 FPS 设置保持不变。第 1 版配置仍可读取，原有桌面墙成员、分组和顺序会保留；旧版数据未记录加入来源，因此不会自动移除已有成员。
 
 批量远程命令、重启尚未提供。实际大规模并发容量需要用真实设备测量。
 
diff --git a/libs/wire/include/preview_subscription.h b/libs/wire/include/preview_subscription.h
index aec4c88e..91b91270 100644
--- a/libs/wire/include/preview_subscription.h
+++ b/libs/wire/include/preview_subscription.h
@@ -16,11 +16,20 @@ namespace crossdesk {
 struct PreviewSubscription {
   uint32_t request_id = 0;
   int fps =
-      0; // 0 pauses encoding/delivery, 1 overview, 8 focus, 60 interactive.
+      0; // 0 pauses; 1/8 legacy previews; 15 negotiated preview; 60 interactive.
   int quality = 0;
   int frame_rate = 30;
   int preference = 0;
   bool audio = false;
+  // v2 bounds are physical pixels. 0/0 restores the legacy source limit.
+  int width = 0;
+  int height = 0;
+  int version = 1;
+
+  static bool ValidResolution(int width, int height) {
+    return (width == 0 && height == 0) ||
+           (width >= 2 && height >= 2 && width <= 16384 && height <= 16384);
+  }
 
   static PreviewSubscription Interactive(int quality, int frame_rate,
                                          int preference, bool audio = false) {
@@ -31,24 +40,32 @@ struct PreviewSubscription {
     return fps == other.fps && quality == other.quality &&
            frame_rate == other.frame_rate &&
            EncoderPreference() == other.EncoderPreference() &&
-           audio == other.audio;
+           audio == other.audio && width == other.width &&
+           height == other.height && version == other.version;
   }
 
   int EncoderPreference() const {
     // Sparse preview input is intentional. Preserve spatial detail instead of
     // applying the interactive frame-rate/keyframe latency budget to it.
-    return fps == 1 || fps == 8 ? 1 : preference;
+    return fps == 1 || fps == 8 || fps == 15 ? 1 : preference;
   }
 
   nlohmann::json ToJson() const {
-    return {{"type", "deskhub_preview"}, {"version", 1},
+    nlohmann::json json = {{"type", "deskhub_preview"}, {"version", version},
             {"request_id", request_id},  {"fps", fps},
             {"quality", quality},        {"frame_rate", frame_rate},
             {"preference", EncoderPreference()}, {"audio", audio}};
+    if (version == 2) {
+      json["width"] = width;
+      json["height"] = height;
+    }
+    return json;
   }
   static std::optional<PreviewSubscription> Parse(const nlohmann::json &json) {
     try {
-      if (json.at("type") != "deskhub_preview" || json.at("version") != 1)
+      if (json.at("type") != "deskhub_preview" ||
+          !json.at("version").is_number_integer() ||
+          (json.at("version") != 1 && json.at("version") != 2))
         return {};
       for (const char *key :
            {"request_id", "fps", "quality", "frame_rate", "preference"})
@@ -66,7 +83,7 @@ struct PreviewSubscription {
                                  json.at("quality"), json.at("frame_rate"),
                                  json.at("preference")};
       if ((result.fps != 0 && result.fps != 1 && result.fps != 8 &&
-           result.fps != 60) ||
+           result.fps != 15 && result.fps != 60) ||
           result.quality < 0 || result.quality > 2 ||
           (result.frame_rate != 30 && result.frame_rate != 60) ||
           result.preference < 0 || result.preference > 2)
@@ -76,6 +93,17 @@ struct PreviewSubscription {
           return {};
         result.audio = json.at("audio").get<bool>();
       }
+      result.version = json.at("version").get<int>();
+      if (result.version == 2) {
+        for (const char *key : {"width", "height"}) {
+          if (!json.at(key).is_number_integer()) return {};
+          const auto value = json.at(key).get<int64_t>();
+          if (value < 0 || value > 16384) return {};
+        }
+        result.width = json.at("width").get<int>();
+        result.height = json.at("height").get<int>();
+        if (!ValidResolution(result.width, result.height)) return {};
+      }
       return result;
     } catch (...) {
       return {};
diff --git a/libs/wire/include/remote_action.h b/libs/wire/include/remote_action.h
index 8608c206..e30fbcde 100644
--- a/libs/wire/include/remote_action.h
+++ b/libs/wire/include/remote_action.h
@@ -138,6 +138,8 @@ struct HostInfo {
   bool supports_privacy_screen;
   bool supports_video_settings;
   bool supports_deskhub_preview;
+  bool supports_deskhub_resolution;
+  bool supports_deskhub_fps15;
 };
 
 struct ServiceStatus {
diff --git a/libs/wire/src/remote_action.cpp b/libs/wire/src/remote_action.cpp
index 3ac5d061..54b1350b 100644
--- a/libs/wire/src/remote_action.cpp
+++ b/libs/wire/src/remote_action.cpp
@@ -27,6 +27,8 @@ void ResetHostInfo(HostInfo& info) {
   info.supports_privacy_screen = false;
   info.supports_video_settings = false;
   info.supports_deskhub_preview = false;
+  info.supports_deskhub_resolution = false;
+  info.supports_deskhub_fps15 = false;
 }
 
 bool AllocateHostDisplays(HostInfo& info, std::size_t count) {
@@ -221,7 +223,9 @@ std::string RemoteAction::ToJson(const RemoteAction& action) {
           {"displays", displays},
           {"supports_privacy_screen", action.i.supports_privacy_screen},
           {"supports_video_settings", action.i.supports_video_settings},
-          {"supports_deskhub_preview", action.i.supports_deskhub_preview}};
+          {"supports_deskhub_preview", action.i.supports_deskhub_preview},
+          {"supports_deskhub_resolution", action.i.supports_deskhub_resolution},
+          {"supports_deskhub_fps15", action.i.supports_deskhub_fps15}};
       break;
     }
     case ControlType::invalid:
@@ -416,6 +420,10 @@ bool RemoteAction::FromJson(const std::string& json_string,
             host_info_object.value("supports_video_settings", false);
         output.i.supports_deskhub_preview =
             host_info_object.value("supports_deskhub_preview", false);
+        output.i.supports_deskhub_resolution =
+            host_info_object.value("supports_deskhub_resolution", false);
+        output.i.supports_deskhub_fps15 =
+            host_info_object.value("supports_deskhub_fps15", false);
         const std::string host_name =
             host_info_object.at("host_name").get<std::string>();
         std::strncpy(output.i.host_name, host_name.c_str(),