Randy, I found the solution.
It was your comment about monitor software that made me consider that no one else is experiencing this in windows, the way I was.
I used the picture (posted above), and cut out just the image of the white selection box and did an image search.
Surprisingly, that led me to what it was. Ironically, it WAS my monitor. When I purchased the Odyssey G8 years ago and plugged it into windows, along with the drivers, Samsung (the maker of this monitor) installs their app "Easy Setting Box". Whether it was an automatic thing, or I just installed the software that came with it, this was what was causing it.
It never occurred to me to take a picture and do an image search for this, always assuming it was a windows feature.
So while I may have found my own solution, it was your questions which led my thought down a different path.
So I just wanted to say- THANK YOU, for your time and effort. I've been dealing with this for years. lol
Have a great weekend.
Sincerely
Brian