I'm getting the same but only on my external Benq monitor - the retina display on the MacBook Pro seems unaffected. It started when I upgraded to Big Sur but only happens for VMware, all other Mac applications are fine. It seems to relate to how much is going on, for example when the VM is booting up the Windows "Window Pane" graphic pulses about once a second and when I move the cursor or hover over things like shut down it also flickers. Seems to reduce a lot if I don't do anything (not a solution!). The full screen minibar fix didn't work for me
