You can adjust the brightness of the background lighting.
Select the following on the infotainment system: Function selector button CAR > control button (Car)* Systems > Audi A6 settings > Background lighting > Brightness.
Turn and press the rotary pushbutton to increase or reduce the brightness.
The background lighting will be switched on when you switch on the headlights with the ignition on.
Note
The setting will be automatically stored and assigned to the remote control key currently in use.