How to place plugin window above EditView?

My plugin works with all opened glyphs, so I want to place it above EditView.
How can I do this?

That can be handled by setting the window level: Apple Developer Documentation

Thanks for quick response, Georg.
I want to place plugin window directly in Glyphs app, not floating window( which is what Level property can do, as I understand (correct me if I’m wrong)
something like this:

You can’t easily put a window inside the edit view. What are you trying to do?