Flow.Launcher/Flow.Launcher.Avalonia/Views/Controls/ExCard.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:controls="using:Flow.Launcher.Avalonia.Views.Controls"
             x:Class="Flow.Launcher.Avalonia.Views.Controls.ExCard"
             x:DataType="controls:ExCard"
             mc:Ignorable="d">

    <UserControl.Styles>
        <Style Selector="controls|ExCard">
            <Setter Property="Template">
                <ControlTemplate TargetType="controls:ExCard">
                    <Expander x:Name="CardExpander"
                              IsExpanded="{TemplateBinding IsExpanded, Mode=TwoWay}"
                              HorizontalAlignment="Stretch">
                        <Expander.Styles>
                            <Style Selector="Expander">
                                <Setter Property="Background" Value="{DynamicResource CardBackgroundFillColorDefaultBrush}" />
                                <Setter Property="BorderBrush" Value="{DynamicResource CardStrokeColorDefaultBrush}" />
                                <Setter Property="BorderThickness" Value="1" />
                                <Setter Property="CornerRadius" Value="5" />
                                <Setter Property="Padding" Value="0" />
                                <Setter Property="HorizontalContentAlignment" Value="Stretch" />
                            </Style>
                            <Style Selector="Expander /template/ ToggleButton#ExpanderHeader">
                                <Setter Property="MinHeight" Value="68" />
                                <Setter Property="Padding" Value="0" />
                            </Style>
                        </Expander.Styles>

                        <Expander.Header>
                            <Grid ColumnDefinitions="Auto,*,Auto,Auto" Margin="0,12">
                                <!-- Icon -->
                                <TextBlock Grid.Column="0"
                                           Text="{TemplateBinding Icon}"
                                           FontFamily="{StaticResource SymbolThemeFontFamily}"
                                           FontSize="20"
                                           Foreground="{DynamicResource TextFillColorPrimaryBrush}"
                                           VerticalAlignment="Center"
                                           Margin="24,0,16,0"
                                           IsVisible="{TemplateBinding Icon, Converter={x:Static StringConverters.IsNotNullOrEmpty}}" />
                                <Border Grid.Column="0" Width="24" 
                                        IsVisible="{TemplateBinding Icon, Converter={x:Static StringConverters.IsNullOrEmpty}}" />

                                <!-- Title and Subtitle -->
                                <StackPanel Grid.Column="1" VerticalAlignment="Center" Margin="0,0,14,0">
                                    <TextBlock Text="{TemplateBinding Title}"
                                               Foreground="{DynamicResource TextFillColorPrimaryBrush}"
                                               TextWrapping="Wrap" />
                                    <TextBlock Text="{TemplateBinding Sub}"
                                               Foreground="{DynamicResource TextFillColorSecondaryBrush}"
                                               FontSize="12"
                                               TextWrapping="Wrap"
                                               Padding="0,0,24,0"
                                               IsVisible="{TemplateBinding Sub, Converter={x:Static StringConverters.IsNotNullOrEmpty}}" />
                                </StackPanel>

                                <!-- Side Content (e.g., toggle switch) -->
                                <ContentPresenter Grid.Column="2"
                                                  Content="{TemplateBinding SideContent}"
                                                  HorizontalAlignment="Right"
                                                  VerticalAlignment="Center"
                                                  Margin="0,0,14,0" />
                            </Grid>
                        </Expander.Header>

                        <!-- Expandable Content -->
                        <ContentPresenter Content="{TemplateBinding Content}"
                                          HorizontalAlignment="Stretch"
                                          Margin="0" />
                    </Expander>
                </ControlTemplate>
            </Setter>
        </Style>
    </UserControl.Styles>

</UserControl>