Actually the hardware usually clamps the door when you tighten the screws and a rubber gasket between the hardware and the door prevents damage.
How to level shower door.
Unscrew the guide at the lower edge of the sliding door.
Stick a pencil through the jamb s screw holes to mark the wall.
A dragging shower or bathtub door can permanently damage both the door and the track if ignored for too long.
As for your shower doors it sounds like a level issue the door slides back because it s out of level.
Frameless glass shower doors can hang from an overhead track or from side hinges.
For the fix pretty much all sliding doors bypass closet doors glass sliding doors and of course shower doors have a way to adjust the rollers.
Kung fu maintenance shows adjusting tub shower doors to seal gaps plus how to install tub door guide repair maintenance video.
Straight to the point.
This is a simple repair to a common problem.
Protect the shower or tub from scratches with a drop cloth.
On the side of the shower opening that will support the door hold a jamb piece against the wall so that its lower end fits into the base track.
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Learn the steps needed to fix it and get it running smoothly again.
Without moving the track use a 4 foot level to adjust the jamb until it s plumb.
To ensure that your new shower door fits correctly you ll need to take 3 separate measurements the total length of the threshold the threshold s halfway point and the height of the walls up to 5 feet 1 5 m.
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