the infotainment screen brightness adjusts along with the instrument panel. there is a switch on the lower left hand side of the steering wheel, on the dash area; it's one of those switches.
If you go to setup > display, and scroll down, you can choose to link the center screen to your gauge cluster brightness button or have it be independent.
I find that the it’s otherwise still way too bright at night, so I unlinked it and have it set to the minimum at night.