I agree with the others... My 2016 Bounder had it and my 2019 Southwind have it.
They ARE on a dimming switch... On both Fleetwood's I've owned, ALL the ceiling lights are dimmable.
Like others say above.
Press and hold the button and it will go up or down to the dimmest or brightest limit.
2019 Fleetwood Southwind 37 F
2018 Jeep Wrangler JL - towing
2020 Jeep Gladiator not towing
We RV'd ALL of the lower 48 states and into Canada