Introduction
After tinkering with it for a while now I finally have got a very much functional global menu working on my Xfce4 desktop running on Debian 10. I will list down the steps I followed to get the global menu configured on my Debian Xfce box in this post.
Global menu vs Local menu
For those of you who might be wondering what a global menu is, it is a way of displaying the application menus on the top of the screen like the way MacOS does. By default the Xfce4 desktop displays the menus right below the Window title bar separately in each Window.