One of the cool features on most modern LG devices (like our LG CX from 2020) is that it has Screen shift which is used to prevent burning of fixed elements like with a monitor or a TV logo.
The only problem is that this is not free, it also cuts off some of the pixels on the edges (which is how it works, it literally shifts the screen randomly. Now on a 4K display you hardly ever need those pixels, but if you want an exact match then shut it off in Settings/All Settings/Picture/Advanced Settings/OLED Settings/Screen Shift
