Have you unzipped the cover to look underneath? I think you’ll find a stock Chevy armrest, but I can’t remember if there’s an easy-to-access bolt. If so the usual procedure is loosen, adjust, retighten. My issues were with the outboard so I didn’t pay that much attention, but that’s how they worked on a previous minivan we owned.
2014 Roadtrek 190 Popular
2008 Scamp 13