windowedMyApp/WindowedMyApp/ActiveWindow.xaml

<Window x:Class="WindowedMyApp.ActiveWindow"
        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:WindowedMyApp"
        mc:Ignorable="d"
        WindowStartupLocation="CenterScreen"
        Title="ActiveWindow" MinHeight="720" MinWidth="1480">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="100"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <StackPanel Orientation="Horizontal" Grid.Row="0">
            <Button x:Name="toTour" Content="Кнопка 1" Width="150" Height="80" Margin="20 0 0 0" Click="toTour_Click"/>

            <Button x:Name="toGif" Content="Кнопка 2" Width="150" Height="80" Margin="20 0 0 0" Click="toGif_Click"/>

            <Button x:Name="toDiagram" Content="Кнопка 3" Width="150" Height="80" Margin="20 0 0 0" Click="toDiagram_Click"/>

            <Button x:Name="toUsersInfo" Content="Кнопка 4" Width="150" Height="80" Margin="20 0 0 0" Click="toUsersInfo_Click"/>
        </StackPanel>
        
        <Frame x:Name="ActiveFrame" Grid.Row="1" NavigationUIVisibility="Hidden">
            
        </Frame>
        
    </Grid>
</Window>