The adjustment for the door is at the upper pivot point. There is a screw that locks everything in place after the door is properly adjusted. (It is Hard to get to and tighten.) The screw and slide lock/pivot bracket usually slide out of position and causes issues for door operation.
Store door/fold against the closet. With a long screwdriver or nut driver slightly loosen the screw so the pivot bracket can just slightly slide. Close screen door so it operates properly. Very carefully stow the door without moving the pivot bracket. Now tighten the bracket retainer screw. Repeat as necessary to get the door center hinges to over extend and lock in place.
Note: There is a plastic slide on top of the pivot bracket that needs to be slid to the front of the trailer before tightening the locking screw. This slide keeps the door pivot pins in place so the door stays in place and will let the door fall
out of its pivot points. When slid to the rear the door can be lifted up and removed from the pivot points.
You will find out the adjustment of the screen door is more an art than a science.