remove toggleswitch minwidth.

src/Avalonia.Themes.Default/ToggleSwitch.xaml

@@ -5,7 +5,7 @@
     <Thickness x:Key="ToggleSwitchTopHeaderMargin">0,0,0,6</Thickness>
     <GridLength x:Key="ToggleSwitchPreContentMargin">6</GridLength>
     <GridLength x:Key="ToggleSwitchPostContentMargin">6</GridLength>
-    <x:Double x:Key="ToggleSwitchThemeMinWidth">154</x:Double>
+    <x:Double x:Key="ToggleSwitchThemeMinWidth">0</x:Double>
     <Thickness x:Key="ToggleSwitchOnStrokeThickness">0</Thickness>
     <Thickness x:Key="ToggleSwitchOuterBorderStrokeThickness">1</Thickness>
     <SolidColorBrush x:Key="ToggleSwitchContentForeground" Color="{DynamicResource ThemeForegroundColor}" />

src/Avalonia.Themes.Fluent/ToggleSwitch.xaml

@@ -5,7 +5,7 @@
     <Thickness x:Key="ToggleSwitchTopHeaderMargin">0,0,0,6</Thickness>
     <GridLength x:Key="ToggleSwitchPreContentMargin">6</GridLength>
     <GridLength x:Key="ToggleSwitchPostContentMargin">6</GridLength>
-    <x:Double x:Key="ToggleSwitchThemeMinWidth">154</x:Double>
+    <x:Double x:Key="ToggleSwitchThemeMinWidth">0</x:Double>
   </Styles.Resources>
   <Design.PreviewWith>
     <StackPanel Margin="20" Width="250" Spacing="24" >