They're not visible on the screenshot.
This is called screen burn, and often happens on amoled when the same text has been visible on screen for a long time.
It eventually fades as the screen is used again.
In extreme cases you would need a hardware replacement.
What should i do know
If the device is under warranty OnePlus will replace the screen for you for free if not you gotta pay for the new screen.
That is not entirely true, is up to the service center to determine if a screen burn damage will be or not covered under warranty.
ummmm here I checked out with guys they said they will replace it if it's under warranty
Again, is up to the service center to validate a warranty
See it's just and update problem u can fix it but next update use auto display on
visit service center and you can make sure buy talking to oneplus support via Twitter
If your phone is in warranty, you can have free screen replacement
EditThe sport and the HDR videos becomes yellow and when we move again the screen turns into normal handiest on the games and the HDR video the display screen turns into yellow like this.
OnePlus x India Film Project Workshop 6: Making of a Music Video on Smartphone
by Saswat Deb Barman, 2021-01-01