In my 2019 35K, it’s located in the bottom cabinet door to the left of the kitchen sink. It’s a red dial mounted against the back wall in that lower cabinet. You’ll have to get on your knees to see it. Not sure if it will be the same for yours if your model is not 35K.
2019 Fleetwood Bounder 35K
2018 Fiat 500 Sport Turbo