Window is the top-level control in Avalonia.
For more information and examples, see the
The default application templates create a single
MainWindow. You can create additional windows from templates too:
Right click the folder in Solution Explorer that you'd like to add the window to
Add -> New Item menu item
In the dialog that appears, navigate to the "Avalonia" section in the category tree
Select "Window (Avalonia)"
Enter your window name under "Name"
Click the "Add" button
Run this command replacing
[namespace] with the namespace you'd like to create the window in and
[name] with the name of the window.
dotnet new avalonia.window -na [namespace] -n [name]
For more information see the .NET core templates repository.