Exactly what Danny said...
Each Inverter has a bypass switch internally... Mine went bad last year and I had to replace the inverter..
Once the RV is plugged into shore power, the bypass switch engages and the power will flow threw the inverter and direct to the outlet wired.
2020 3991RD with-
17.5 Goodyear 114's , Titan Disc brakes, MorRyde 8K IS, Onan 6.5..