MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage
    x:Class="MauiApp1.MainPage"
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml">

    <Grid ColumnDefinitions="*" RowDefinitions="auto, *">
        <ContentView
            Grid.Row="0"
            Grid.Column="0"
            BackgroundColor="Red"
            HeightRequest="48">
            <HorizontalStackLayout>
                <Button x:Name="_SwitchVO" Clicked="CVChange_Clicked" Text="CV: End" />
                <Button Clicked="New_Clicked" Text="Add 5" />
                <Button Clicked="Remove_Clicked" Text="Remove Last" />
                <Button
                    x:Name="_Header"
                    Clicked="Header_Clicked"
                    Text="H: Off" />
                <Button
                    x:Name="_Footer"
                    Clicked="Footer_Clicked"
                    Text="F: Off" />
            </HorizontalStackLayout>
        </ContentView>
        <CollectionView
            x:Name="_CV"
            Grid.Row="1"
            VerticalOptions="End" />

    </Grid>

</ContentPage>