Sounds like this is a vinyl patio door with a vinyl screen door track.
Patio screen door off track.
The door should slide right out of the top track once you ve freed it from the bottom track.
Prime line d 1655 sliding screen door track 6 aluminum anodized pack of 1.
Remove the door by pulling it out of the top track of the door frame.
Although there is more than one design for sliding patio screen doors the most common one employs a pair of rollers on the bottom of the door that fit on a track on the bottom of the frame.
Kung fu maintenance demonstrates how to replace some wheels that are not rolling right on a patio slider door that is coming out of it s track and not rollin.
How to fix a screen door that s off its rollers.
The problem with thin vinyl tracks is that they get brittle with exposure to the sun and finally break in pieces.
Do the same at the other corner and then remove the door by pulling it down and out of the upper track.
Remove the screen door from the frame by grasping it on both sides and lifting the rollers off the lower track.
When you open or close the door it doesn t actually slide.
Angle the bottom toward you and lift it a little further to disengage the runners on the upper track then pull it out of the doorway.
With the wheel raised pull the corner of the frame out of the track.
A sliding glass door glides back and forth along a track.
During pleasant weather you can leave the glass open and close the sliding screen door.
Instead these wheels ride the track.
Lift one wheel off the screen door track using your finger or a screwdriver.