Dometic IS Atwood (Dometic owns Atwood)
Model Number will be listed on data sticker in outside compartment
IF 10gal model will be GC10A-4E
If 6gal model will be GC6AA-10E
If it is GAS/Electric Combo and you are in CG why do you have the Propane ON?
Propane Noisy then you can adjust the air shutter to control flame (fuel/air ratio)
Only 1/4 of slots should be open for a good BLUE Flame that is fairly quiet

YES you can turn BOTH ON for fastest recovery time
Both use the same set of T-stats so both will turn on at same time and off at same time.
At night...turn the GAS off so you don't have to listen to it fire up