If you are in a campground try to find another owner with the same window or look around for a mobile tech that is at the CG.
Call the dealer/manufacturer.
We don't have those windows so have no direct experience.
Just guessing; is there a chance you slide up the window to the next notch then immediately slide it down?
Dick_B
2003 SunnyBrook 27FKS
2011 3/4 T Chevrolet Suburban
Equal-i-zer Hitch
One wife, two electric bikes (both Currie Tech Path+ models)