Hi there! I hope you are well. My name is, Zadee. I'm an Independent Advisor and a Microsoft user like you. I'll try my best to help you today.
That's a screen burn. It might get fixed over time but not a guarantee, some are permanent marks on the screen. To prevent this in the future, I suggest at least letting the computer turn off the display whenever it is not being used
https://www.youtube.com/watch?v=rschk-IZt-U
I hope this info helps. Have a wonderful day/evening!
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