diff --git a/demo/Semi.Avalonia.Demo/Views/MainView.axaml.cs b/demo/Semi.Avalonia.Demo/Views/MainView.axaml.cs
index 53248b1..5316df1 100644
--- a/demo/Semi.Avalonia.Demo/Views/MainView.axaml.cs
+++ b/demo/Semi.Avalonia.Demo/Views/MainView.axaml.cs
@@ -34,81 +34,67 @@ public partial class MainViewModel : ObservableObject
         [
             new MenuItemViewModel
             {
-                Header = "High Contrast Theme",
-                Items =
-                [
-                    new MenuItemViewModel
-                    {
-                        Header = "Aquatic",
-                        Command = SelectThemeCommand,
-                        CommandParameter = SemiTheme.Aquatic
-                    },
-                    new MenuItemViewModel
-                    {
-                        Header = "Desert",
-                        Command = SelectThemeCommand,
-                        CommandParameter = SemiTheme.Desert
-                    },
-                    new MenuItemViewModel
-                    {
-                        Header = "Dusk",
-                        Command = SelectThemeCommand,
-                        CommandParameter = SemiTheme.Dusk
-                    },
-                    new MenuItemViewModel
-                    {
-                        Header = "NightSky",
-                        Command = SelectThemeCommand,
-                        CommandParameter = SemiTheme.NightSky
-                    },
-                ]
-            }
+                Header = "Aquatic",
+                Command = SelectThemeCommand,
+                CommandParameter = SemiTheme.Aquatic
+            },
+            new MenuItemViewModel
+            {
+                Header = "Desert",
+                Command = SelectThemeCommand,
+                CommandParameter = SemiTheme.Desert
+            },
+            new MenuItemViewModel
+            {
+                Header = "Dusk",
+                Command = SelectThemeCommand,
+                CommandParameter = SemiTheme.Dusk
+            },
+            new MenuItemViewModel
+            {
+                Header = "NightSky",
+                Command = SelectThemeCommand,
+                CommandParameter = SemiTheme.NightSky
+            },
         ];
         LocaleItems =
         [
             new MenuItemViewModel
             {
-                Header = "Locale",
-                Items =
-                [
-                    new MenuItemViewModel
-                    {
-                        Header = "简体中文",
-                        Command = SelectLocaleCommand,
-                        CommandParameter = new System.Globalization.CultureInfo("zh-cn")
-                    },
-                    new MenuItemViewModel
-                    {
-                        Header = "English",
-                        Command = SelectLocaleCommand,
-                        CommandParameter = new System.Globalization.CultureInfo("en-us")
-                    },
-                    new MenuItemViewModel
-                    {
-                        Header = "日本語",
-                        Command = SelectLocaleCommand,
-                        CommandParameter = new System.Globalization.CultureInfo("ja-jp")
-                    },
-                    new MenuItemViewModel
-                    {
-                        Header = "Українська",
-                        Command = SelectLocaleCommand,
-                        CommandParameter = new System.Globalization.CultureInfo("uk-ua")
-                    },
-                    new MenuItemViewModel
-                    {
-                        Header = "Русский",
-                        Command = SelectLocaleCommand,
-                        CommandParameter = new System.Globalization.CultureInfo("ru-ru")
-                    },
-                    new MenuItemViewModel
-                    {
-                        Header = "繁體中文",
-                        Command = SelectLocaleCommand,
-                        CommandParameter = new System.Globalization.CultureInfo("zh-tw")
-                    },
-                ]
-            }
+                Header = "简体中文",
+                Command = SelectLocaleCommand,
+                CommandParameter = new System.Globalization.CultureInfo("zh-cn")
+            },
+            new MenuItemViewModel
+            {
+                Header = "English",
+                Command = SelectLocaleCommand,
+                CommandParameter = new System.Globalization.CultureInfo("en-us")
+            },
+            new MenuItemViewModel
+            {
+                Header = "日本語",
+                Command = SelectLocaleCommand,
+                CommandParameter = new System.Globalization.CultureInfo("ja-jp")
+            },
+            new MenuItemViewModel
+            {
+                Header = "Українська",
+                Command = SelectLocaleCommand,
+                CommandParameter = new System.Globalization.CultureInfo("uk-ua")
+            },
+            new MenuItemViewModel
+            {
+                Header = "Русский",
+                Command = SelectLocaleCommand,
+                CommandParameter = new System.Globalization.CultureInfo("ru-ru")
+            },
+            new MenuItemViewModel
+            {
+                Header = "繁體中文",
+                Command = SelectLocaleCommand,
+                CommandParameter = new System.Globalization.CultureInfo("zh-tw")
+            },
         ];
     }