I have a 2016 31FK so can share some specifics. The inverter powers only the socket behind the big TV. The bedroom TV is not powered and no other outlets are either.
It's only a 1000 watt inverter so you can't plug in a toaster oven (you wouldn't want to anyway.)
There's a safety relay that powers that outlet down when the coach is on. To make sure you're not watching TV and driving. Should you ever want to change that, the procedure is easy and we can help.
The display can show you some useful info. I usually leave it as you have it - showing the charge flowing into the battery.
Finally you can Google the make and model and download a PDF copy of the manual.
2016 Greyhawk 31FK