diff --git a/yy-admin-master/YY.Admin/Module/TabSource.cs b/yy-admin-master/YY.Admin/Module/TabSource.cs
index 264fba3..f5e4a0b 100644
--- a/yy-admin-master/YY.Admin/Module/TabSource.cs
+++ b/yy-admin-master/YY.Admin/Module/TabSource.cs
@@ -5,15 +5,27 @@ namespace YY.Admin.Module
 {
     public class TabSource : BindableBase
     {
+        private string? _name;
+
         /// <summary>
         /// 名称
         /// </summary>
-        public virtual string? Name { get; set; }
+        public virtual string? Name
+        {
+            get => _name;
+            set => SetProperty(ref _name, value);
+        }
+
+        private string? _icon;
 
         /// <summary>
         /// 图标
         /// </summary>
-        public virtual string? Icon { get; set; }
+        public virtual string? Icon
+        {
+            get => _icon;
+            set => SetProperty(ref _icon, value);
+        }
 
         /// <summary>
         /// 图标类型
diff --git a/yy-admin-master/YY.Admin/ViewModels/MainWindowViewModel.cs b/yy-admin-master/YY.Admin/ViewModels/MainWindowViewModel.cs
index 14ae828..73c958d 100644
--- a/yy-admin-master/YY.Admin/ViewModels/MainWindowViewModel.cs
+++ b/yy-admin-master/YY.Admin/ViewModels/MainWindowViewModel.cs
@@ -165,6 +165,18 @@ namespace YY.Admin.ViewModels
             set => SetProperty(ref _isAppSettingsOpen, value);
         }
 
+        /// <summary>
+        /// 为 true 时隐藏左侧功能菜单树（次级侧栏）
+        /// </summary>
+        private bool _isMenuTreePanelCollapsed;
+        public bool IsMenuTreePanelCollapsed
+        {
+            get => _isMenuTreePanelCollapsed;
+            set => SetProperty(ref _isMenuTreePanelCollapsed, value);
+        }
+
+        private NavItem? _menuTreeToggleNavItem;
+
         private AppSettingsViewModel? _appSettingsViewModel;
         public AppSettingsViewModel? AppSettingsViewModel {
             get => _appSettingsViewModel;
@@ -175,6 +187,7 @@ namespace YY.Admin.ViewModels
         public ICommand ResetAppSettingsCommand { get; }
         public ICommand OpenAppSettingsCommand { get; }
         public ICommand OpenServerSettingsCommand { get; }
+        public ICommand ToggleMenuTreePanelCommand { get; }
 
         #endregion
 
@@ -212,6 +225,7 @@ namespace YY.Admin.ViewModels
             OpenAppSettingsCommand = new DelegateCommand(OpenAppSettings);
             ResetAppSettingsCommand = new DelegateCommand(ResetAppSettings);
             OpenServerSettingsCommand = new DelegateCommand(OpenServerSettings);
+            ToggleMenuTreePanelCommand = new DelegateCommand(ToggleMenuTreePanel);
 
             // 初始化Sidebar数据
             InitNavItems();
@@ -300,6 +314,13 @@ namespace YY.Admin.ViewModels
                     Name = "Tab区域",
                     Command = new DelegateCommand<NavItem>(OnOpenOrActivateTab)
                 },
+                (_menuTreeToggleNavItem = new NavItem {
+                    Icon = "ChevronDoubleLeft",
+                    Name = "折叠菜单",
+                    AlignBottom = true,
+                    IsActive = false,
+                    Command = ToggleMenuTreePanelCommand
+                }),
                 new NavItem {
                     Icon = "Server",
                     Name = "服务器设置",
@@ -678,6 +699,29 @@ namespace YY.Admin.ViewModels
             }
         }
 
+        /// <summary>
+        /// 折叠 / 展示左侧菜单树区域
+        /// </summary>
+        private void ToggleMenuTreePanel()
+        {
+            IsMenuTreePanelCollapsed = !IsMenuTreePanelCollapsed;
+            if (_menuTreeToggleNavItem == null)
+            {
+                return;
+            }
+
+            if (IsMenuTreePanelCollapsed)
+            {
+                _menuTreeToggleNavItem.Name = "展示菜单";
+                _menuTreeToggleNavItem.Icon = "ChevronDoubleRight";
+            }
+            else
+            {
+                _menuTreeToggleNavItem.Name = "折叠菜单";
+                _menuTreeToggleNavItem.Icon = "ChevronDoubleLeft";
+            }
+        }
+
         private void OpenServerSettings()
         {
             _dialogService.ShowDialog("ServerSettingsDialog", r =>
diff --git a/yy-admin-master/YY.Admin/Views/MainWindow.xaml b/yy-admin-master/YY.Admin/Views/MainWindow.xaml
index 8a4465d..bc3b839 100644
--- a/yy-admin-master/YY.Admin/Views/MainWindow.xaml
+++ b/yy-admin-master/YY.Admin/Views/MainWindow.xaml
@@ -145,12 +145,34 @@
 
             <Grid x:Name="MainContentGrid">
                 <Grid.ColumnDefinitions>
-                    <ColumnDefinition 
-                        x:Name="LeftMenuTreeCol" 
-                        Width="250" 
-                        MinWidth="50" 
-                        MaxWidth="{Binding ActualWidth, ElementName=MainContentGrid, Converter={StaticResource MaxWidthConverter}, ConverterParameter=50}"/>
-                    <ColumnDefinition Width="4"/>
+                    <ColumnDefinition x:Name="LeftMenuTreeCol">
+                        <ColumnDefinition.Style>
+                            <Style TargetType="ColumnDefinition">
+                                <Setter Property="Width" Value="250"/>
+                                <Setter Property="MinWidth" Value="50"/>
+                                <Setter Property="MaxWidth" Value="{Binding ActualWidth, ElementName=MainContentGrid, Converter={StaticResource MaxWidthConverter}, ConverterParameter=50}"/>
+                                <Style.Triggers>
+                                    <DataTrigger Binding="{Binding IsMenuTreePanelCollapsed}" Value="True">
+                                        <Setter Property="Width" Value="0"/>
+                                        <Setter Property="MinWidth" Value="0"/>
+                                        <Setter Property="MaxWidth" Value="0"/>
+                                    </DataTrigger>
+                                </Style.Triggers>
+                            </Style>
+                        </ColumnDefinition.Style>
+                    </ColumnDefinition>
+                    <ColumnDefinition>
+                        <ColumnDefinition.Style>
+                            <Style TargetType="ColumnDefinition">
+                                <Setter Property="Width" Value="4"/>
+                                <Style.Triggers>
+                                    <DataTrigger Binding="{Binding IsMenuTreePanelCollapsed}" Value="True">
+                                        <Setter Property="Width" Value="0"/>
+                                    </DataTrigger>
+                                </Style.Triggers>
+                            </Style>
+                        </ColumnDefinition.Style>
+                    </ColumnDefinition>
                     <ColumnDefinition Width="*"/>
                 </Grid.ColumnDefinitions>
                 <!-- Sidebar侧边栏区域 -->
@@ -159,6 +181,16 @@
                     BorderThickness="0,0,1,0"
                     BorderBrush="{DynamicResource BorderBrush}"
                     Background="{DynamicResource RegionBrush}">
+                    <Border.Style>
+                        <Style TargetType="Border">
+                            <Setter Property="Visibility" Value="Visible"/>
+                            <Style.Triggers>
+                                <DataTrigger Binding="{Binding IsMenuTreePanelCollapsed}" Value="True">
+                                    <Setter Property="Visibility" Value="Collapsed"/>
+                                </DataTrigger>
+                            </Style.Triggers>
+                        </Style>
+                    </Border.Style>
                     <ContentControl prism:RegionManager.RegionName="{x:Static consts:CommonConst.MenuRegion}"/>
                 </Border>
                 <!-- 拖拽分隔条 -->
@@ -170,7 +202,18 @@
                     ShowsPreview="True"
                     Cursor="SizeWE"
                     Background="{DynamicResource RegionBrush}"
-                    PreviewStyle="{StaticResource GridSplitterPreviewStyle}"/>
+                    PreviewStyle="{StaticResource GridSplitterPreviewStyle}">
+                    <GridSplitter.Style>
+                        <Style TargetType="GridSplitter">
+                            <Setter Property="Visibility" Value="Visible"/>
+                            <Style.Triggers>
+                                <DataTrigger Binding="{Binding IsMenuTreePanelCollapsed}" Value="True">
+                                    <Setter Property="Visibility" Value="Collapsed"/>
+                                </DataTrigger>
+                            </Style.Triggers>
+                        </Style>
+                    </GridSplitter.Style>
+                </GridSplitter>
                 <!-- 主内容区域 -->
                 <Border 
                     Grid.Column="2"