Not sure if the DSDP screen door is the same as mine but If your talking about the screen fabric coming out of or bunching in the vertical side tracks, then I have found that by releasing the catches at the bottom and slowly letting it retract all the way up them and working it back down & up a few times the screen fabric will line itself back up in the narrows of the side tracks. I also suspect that's about all that can be done given the design. I have even considered going to an aluminum window/screen shop and having them make me a framed replacement but that likely won't happen due to not being able to color match it.
My learning has been that the bunching seems to happen when someone or something (i.e. you're back or elbow) touches the screen (material) itself when entering (closing) or exiting (opening) the main door which both my wife and I purposefully nowadays try to avoid. I did install another small knob on the exterior side of the plexiglass door handle slide window opposite of the interior slide knob and can't fathom why Newmar designed the screen door with only one (int.) knob to slide it open/closed.
Finding The Roads That Await Us
Rick & Lydia Williams
2018 Newmar Essex 4553
NKK Member 21619 / FMCA Member 465836