Hi - Not sure what motorhome you have, but if it is a View / Navion - I do know of an easy way.
The circuit breaker for the awning is located in the CB panel in the outboard base of the passenger seat. When you open the passenger door you can see it plainly enough. The 15 amp awning breaker is on the second row. If you lift up the styrofoam dust cover under the seat, you’ll see the yellow power wire on the back of the CB. If you pull the spade connector off, you’ll disable the awning. There is a blank slot right above it on our ‘21 View, so it was easy enough to get at.