Our shower door opening is absolute square but the show door well that's a different story
. We have to give a slight nugget at the bottom handle side to secure the door. Must have been a Friday afternoon install without any quality control follow-up. This will be a winter project in the shop. Hopefully putting diagonal pressure on the door will allow the glass to move in the frame and bring it into square...or we'll have to purchase a new shower door.
I have noticed that when all the slides are deployed and the TT is perfectly level
side-to-side and forward/aft doors do not stick...assuming they all were hung correctly in a squared frame.
Hope you resolve your door problem