I believe there are some assumptions being made here. Can we get a picture of the inverter or the specific model number? Xantrex make multiple 1800w models, some are simple no switch, some have switch, some have both switch and charger etc...
Agree on the generator switch though, that is usually separate.
2022 Jay Feather Micro 166FBS
2021 RAM 1500 5.7 eTorque