The passenger's side window is off track.
If the passenger side window has come off the track, then it is likely that the door panel will have to be removed and the window re-positioned correctly on the track. The fact that the window came off the track in the first place suggests that there may be a problem somewhere. I would recommend having a professional technician, such as one from YourMechanic, inspect at the window in question, and proceed from there.
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