Here is a screenshot of my Gnome40 set-up.

     https://www.dropbox.com/s/2o40vvqgfs6vauk/Gnome40_Rawhide.png?dl=0

I really like the idea of hitting the SuperKey twice to get to this view of the desktop

Just curious why anyone would use Gnome Tweaks in Gnome 40 ?

I like Gnome40 better than Mate for several reasons.     I like the idea of using
the latest wayland / xwayland / mutter instead of X, however, I hope to learn other
wayland compositors.  

I am using a Kensington trackball that does not have a scroll function.    However,
I guess there are ways to program the 4 buttons to do shortcuts.

David Locklear