mi note 10 pro

hi all, I need your advice, somehow my phone display is like the one below (my own real photo is attached), with no drop damage, no pressure, no hard use, and no water damage. not even any single scratch. one year ago I see that the screen starts to turn off unexpectedly while working, after...

I'd like to know how to change it. I'm trying to change by using Theme app but it doesn't work. Thanks in advance