Suburban Water Heater

Just bought a new 2021 Gulf Stream Class C Conquest 6250 and, though I am not new to RVing my question comes about due to a couple of things: lack of familiarity with this model and inadequate resources.

Short story - picked up the unit yesterday with almost no walk-through and found out later, no documentation (manuals, etc.). I have had multiple RVs with gas/electric hot water tanks but this one, has me a bit unsure.

Even though I did download the manual (Suburban SW6DE) I can't quite figure out exactly what I have. My Class A has a tank that runs on propane, 12VDC or 120VAC and the control panel offers each option. When I read the manual for this one it seems to imply that it can also run on all 3 but I'm not sure how I choose my options.

I have a control panel that simply has one switch and one "power-on" light, which I am assuming is the propane driven option. Inside the tank compartment there is one more on-off switch that seems to be for 12VDC but, frankly I don't see anything for 120VAC or how one would be certain which option they have chosen. For example, if I have the electric switch (I believe 12VDC) turned on and I also turn on the switch inside (which I assume is propane) does one override the other. The manual is not clear.

Any help is appreciated and do expect more questions seeing as how I have very little in the way of documentation and the dealer actually did not do much of anything at the walk through.

Thanks in advance.