Hello, I just upgraded to Big Sur and I have been having this issue with Photoshop 2020. Kindly see video. When I use the transform tool, the screen flickers very bad. But when I use it on a smart object, nothing like that happens.
We're sorry about the trouble with Photoshop 2020 due to the screen flickering. Would you mind sharing the exact macOS version you're using along with the exact version of Photoshop?
You can try updating Photoshop to the latest version (22.5) to check if it helps. If the issue persists, try enabling the option to Deactivate Native Canvas in Photoshop by going to Preferences, then Performance. Onc done, quit & relaunch Photoshop to check if that helps.
Did you ever find a fix to this? I'm also using a MBP with the GeForce 750M. Starting to think its this particular GPU. I've had issues with Premire pro not playing video back like it did when I was running Mojave.
Though the flickering when resizing is so annoying.