Hi again, Lester - seriously, I'm a lost cause!
I right-clicked on empty space on screen, display settings, advanced display settings, but after that, Properties did not show up nor Reset Display settings.
I do know that I've got all Microsoft updates so I'm not missing anything. I did the "sfc/scannow" anyway, but no available updates.
It's kind of like fog, a shadow or smudge.
(I couldn't follow the one minute screenshot video on how to attach an image - way beyond me.)
I do thank you for your patience and appreciate your help, but I think it's all just over my head. I thought it was maybe a really easy fix, but it's proving a bit more technical and I'm out of my element. Thanks again for your efforts!