We are sorry to hear about your experience with your Samsung Galaxy Note 20 Ultra having issues with the bright light on the notification bar, and we apologize for the inconvenience it caused you.
I really understand your worries that your device has might have Amoled burn-in, and if it happens to my device, I'm worried too.
I highly recommend bringing your device to the nearest Samsung Authorized Service Center in your area. Rest assured that our Samsung engineers and technicians are competent to assess your device, offer suggestions, and provide prompt solutions to restore it to optimum performance.
For more assistance and guidance, you may contact us via our online Samsung Customer Care support channels below.