Contact Kinro, the window manufacturer, they'll probably send you a replacement.
If it's the one behind the coach after replacing 2 broken ones, still had a new one in the package, I just wired the window shut, couldn't have used it in an emergency without moving the couch out a couple feet anyway. Not sure I would've fit through it either. The window at the end of the couch was a much better choice to exit.
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Danny & Linda
Full-timed 10+ years
Former '13 FB owner
Traded '13 GMC Denali DRW D/A
Currently rv & truckless
Replacement undetermined
I got mine from the Techs and last years Rally for free! But I didn't have them put it in. I did it myself later.
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Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top