How to Hide the notch?

In this way, this part of the display will always remain black and blend in (to some extent) with the smartphone's bezels. Obviously, this works best with an OLED display. This isn't possible on the LG G7 ThinQ, since the notch is only deactivated on LG system applications (not those installed later). On the OPPO R15 Pro, you can disable the notch for each app, but this doesn't work all the time.