MAUi Catalyst app not working

Hi,

I created a simple MAUI app with Menu and tried to run it on My Mac but I am not getting the menu, just getting the window only.

Here is my XAML:

<?xml version="1.0" encoding="utf-8" ?>  
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"  
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"  
    x:Class="MauiAppTest.MainPage">  
    <ContentPage.MenuBarItems>  
        <MenuBarItem Text="File">  
            <MenuFlyoutItem Text="Exit" />  
        </MenuBarItem>  
        <MenuBarItem Text="Locations">  
            <MenuFlyoutSubItem Text="Change Location">  
                <MenuFlyoutItem Text="Redmond, USA" />  
                <MenuFlyoutItem Text="London, UK" />  
                <MenuFlyoutItem Text="Berlin, DE" />  
            </MenuFlyoutSubItem>  
            <MenuFlyoutItem Text="Add Location" />  
        </MenuBarItem>  
        <MenuBarItem Text="View">  
            <MenuFlyoutItem Text="Refresh" />  
            <MenuFlyoutItem Text="Change Theme" />  
        </MenuBarItem>  
    </ContentPage.MenuBarItems>  
</ContentPage>  

and this is my App.xaml.cs:

namespace MauiAppTest;  
  
public partial class App : Application  
{  
	public App()  
	{  
		InitializeComponent();  
  
        // MainPage = new AppShell();  
        MainPage = new NavigationPage(new MainPage());  
    }  
}  

Kindly help..

Thanks.
Jassim