Mine has two switches that might be involved in your current problem.
One is by my left knee as I sit in the driver's seat and allows the dash radio to run off of either the truck battery or the house battery.
It would appear that your similar switch is set to "house or chassis".
It should normally be set to power the accessories from the truck battery.
The second switch is a house battery disconnect which is located immediately inside the side door of the coach.
It would appear that yours is turned OFF. It should be ON while the coach is being driven or actively in use.
P.S. If you bought this from a dealer, you should make an appointment to go BACK to them with your spouse for them to explain the basic systems to you: power, generator, propane and water. If done right, this will take AT LEAST a half hour and maybe more.