Screen burn-in or ghost image is a permanent discoloration of areas on a screen. When an image stays on a screen for too long, some pixels get overused and degrade quickly, causing discoloration in certain areas. This is why screen savers were so popular back in the day. The idea is to move an image around to make sure that no one area of the display remains illuminated for a long time.
take a screenshot where the status bar is visible
rotate the screen to landscape then back to portrait (do it 5 times so the elements drift for a significant amount of pixels)
open the screenshot in Samsung Gallery
The status (and navigation) bar overlapping your screenshot should be visible, and you should be able to notice whether the status bar elements have moved their position. In One UI 6 they are static no matter what you do.
One UI 5 vs One UI 6 screenshot
On One UI 6, the icons stay in the same place and this makes the screens of Samsung devices running Android 14 susceptible to burn-in.
Samsung may fix this in the coming days but with no official assurance from the company, it’s hard to be certain of it. If you have already downloaded Android 14, you may find solace in the fact that screen burn-ins are rare and unless you leave a static image on your phone for an unrealistically long period of time at peak brightness, you have nothing to worry about. And even if it somehow does end up happening, rest assured that burn-ins don’t make a screen non-functional, they just look annoying.