We had one on our previous camper, it was nice to block the sun from that side. It had a short piece, maybe 6" long that went in the spare channel in the main awning roller, and you would zip the sun screen onto the short piece.
On my current camper, I added an LED strip to the awning roller, in that channel.
Doug and Patience and Shelby the mutt
2015 Crossroads Sunset Trail Reserve ST26RB
2013 Ford F-150 3.5 EcoBoost XLT Supercab 4x4