“ How do you adjust an RV propane regulator?
If you need to adjust your RV propane regulator, remove the cap and notice the adjustment screw underneath. Turning this screw clockwise will increase the outlet pressure, in most cases, but the proper direction of the adjustment will also be marked on the regulator itself.”
https://rvshare.com/blog/rv-propane-regulator/
I never knew they were adjustable but it only makes sense.