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Search for it. I have it as well and almost everyone with Note 20 Ultra. The intensity may vary but pathetic for a $1500 phone.
Are you referring to the faded shade in the middle? If I am not mistaken that is the area where the mouse pad is located when the phone screen is in Dex station mode.
I believe that is a hardware beneath the screen for mouse pad just like the fingerprint sensor where you can see it through the screen in direct sunlight. I am not so sure about it.