If you hold down a few of them at the same time, you seemed to be able to turn on and off lights not necessarily linked to the numbers on the panels. My circled & numbered areas of the ceiling lights were more for my own reference when describing the lights than something we linked to the numbers on the panel.
Yes, the arrows seemed to dim the lights. The solid black dot could turn on or off the lights as could the one that resembles a sun. We couldn’t seem to find any notable distinctions in their functions.
Mine were that I could turn them all off as it was a terrible waste of electricity! Although another user may have had an alternative use.
No, that’s just bad lighting when I took the picture! Occasionally we could get some of the numbered buttons to turn red though
There were regular light switches on the walls for the bedrooms & bathroom, none for the living area.
Basically by playing with the panel! We held down lots of buttons one side and pressed a combination of the top right buttons. Then we tried pressing each of the numbered buttons in turn. We tried quick presses and long holds (30 seconds). The 30 second holds seemed to be needed to turn anything off.