User20/WpfApp1/MainWindow.xaml

<Window x:Class="WpfApp1.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:WpfApp1"
        mc:Ignorable="d"
        Title="Приятный шелест" Height="450" Width="800" MinHeight="450" MinWidth="800" Icon="Resources/Приятный шелест.ico">
    <Grid>
        <Frame Name="FrmMain" Grid.Row="1" NavigationUIVisibility="Hidden"></Frame>
    </Grid>
</Window>