If the hinge is an assembly, you can rotate it in the explode process. If it was just a part, you either need a flexible state of the hinge in a family table or the hinge itself is a family table part. It is hard to tell the way it was done before other than looking at the history file. I vote for the hinge being an assembly with the option to manipulate it in the explode dialog. Otherwise, it gets a little involved.
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