The port and starboard glass panels are held in place by a 3 or 4' metal "J" clip kind of thing. The metal frame has a matching "J" and the 2 mate together very tightly. The 4' piece then has 4 screws that fasten it to the outside of the frame. For your panel to slide to the center , the clip must be missing.
I know my explanation is confusing. I'll go down to the boat and take a picture for you.
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-Shawn-
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