I have noticed some flickering issues from time to time - it used to be much worse. Beyond keeping my drivers up to date, and occasionally rolling them back, I have a profile for Cubase 11 in the NVIDIA Control Panel that seems to help alleviate most of the issues. I got the idea for it from this thread: Update on screen lag & freezes - #3 by GNP
After playing around with many other settings and getting some weird black screen behavior every time the GPU is called on to draw something. I arrived at using these 2 settings:
Max Frame Rate: 120 FPS (my system actual setting)
Preferred refresh rate: Highest available
I still get occasional “window bleed” where I see some part of Cubase or another window come through, but it’s definitely not a constant thing. I mainly see that issue when I’m in the separate audio event editor window and holding ctrl+alt to pan through audio in a clip.
Hope that helps!