Press down to decrease or lift up to increase the brightness of the instrument panel in front of you. If, in daylight, the lights come on automatically (the sensor in the screen thinks that it is too dark!) the instrument panel goes very dark indeed and you can alter it back to be readable.
No, only a reversing camera. A 360 deg. camera might have been available in one of the packs, but I am not too sure. What is now available (MY21) could all have changed, what with RS-Line now being the top spec. Mine is MY20 and at the time S-Edition was the top spec.