Okay, I missed what the real problem was and that you may not be getting any power to anything inside, so let's start over and look at what to expect from the start.
The problem with reading these drawings is that when we first start looking there is just too much there, so we need to start with smaller parts and then we can study each small part with less confusion.
So when we plug the power cord into power or run the generator, it sends power to a transfer switch and it decides to use the cord power or the generator power. That may be where things are not working but we need to check where it stops.
When things are working right, the transfer switch chooses the correct one and sends the power to the load center like in this part of the drawing.
Power in like the blue lines and out to the load center main 30 amp breaker like the green line. That breaker is connected to all the smaller breakers and if they are on the power can go out to the different parts of the RV like on the yellow lines!
To save space and cut it down some, I only marked a couple that I thought might be easy to spot if they are working. Things like the bathroom outlet. RCP is short for receptacle and then it tells kind of where to find that outlet!
An important one to know about is the first one that shows Rcp-GFI as that is the one which may trip and cut off all the outlets on down the line! So know where it is and check it first as it can make several others go dead but easy to push the reset button.
The second picture here shows a gizmo to shed load if there are too many things on that line using power at the same time. It will often only let you use the microwave or the electric water heater at the same time and it cuts off one or the other at times.
When testing, just leave the water heater turned off and then the microwave lights are easy to look to see if it is getting power!
I did not read carefully enough and got into checking the inverter but if there are lots of other parts not working, you need to look back toward the power cord and find where there is a "hole in the road".
If there are some things like the bathroom outlet working but not others, it is likely to be between the load center and whatever is bad.
But if nothing works on 110 AC, then maybe it is as simple as the 30 amp breaker kicked off or transfer switch or maybe just the plug is loose in the power outlet??
Kind of like a bunch of garden hoses all tied together? If it was water, you would go along and check the faucet was on and look for where the water stopped, just the problem is we can't see the power, just what it makes happen.
Keep in mind that the lights, vent fans, and smaller things are running off battery and will likely still be working, so don't let that confuse you.
See if that makes sense and shout back if needing more help if it looks like the transfer switch is bad. If you can plug in and don't get anything to work, it can help to try running the generator to see if that makes things work as it might just be "stuck" on one or the other gen. or cord?