If you have the Samsung Residential refrigerator, you can not turn it off completely. You can put it into "Demo" mode, which is designed for the light to be on, but no refrigeration. But it is not truly "off". The only way to turn it off completely is to unplug it, or flip the breaker for the circuit it's on.
I don't know where the converter / breaker box is in your camper, but it's probably a plastic cover and when you push the top, it's spring loaded and the door will pop open. You'll see a set of 120 volt breakers like in your house and you see a set of automotive fuses, like in your car.
2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually