Login Screen in Big Sur

Has anybody had any luck in figuring out how to change the new login screen apple is seemingly forcing on users in Big Sur? I can’t seem to change it.

Are you trying to change the background image, or something else? It seems likely the components of it are part of the read-only System volume.

Trying to get rid of the god-awful red/orange background and select my own. Was always able to change prior OS versions, but this one seems fixed.