On my Linux computer, I have 11 windows. I use the half, so we can't see other things.
I hide my windows, so I can't see what I do when I show my activities (Windows button), AND I use keyboard shortcuts (Ctrl+Alt+M = hide window, Ctrl+Maj+1 to 4 = go to activity 4, and Ctrl+Maj+5 = go to activity 11 (the last).