maui-linux/Xamarin.Forms.Sandbox.WPF/MainWindow.xaml

<wpf:FormsApplicationPage x:Class="Xamarin.Forms.Sandbox.WPF.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        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:local="clr-namespace:Xamarin.Forms.Sandbox.WPF"
        xmlns:wpf="clr-namespace:Xamarin.Forms.Platform.WPF;assembly=Xamarin.Forms.Platform.WPF"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        
    </Grid>
</wpf:FormsApplicationPage>