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Why can I Flatten but not Unfold?

Question asked by Micky Ketchell on Feb 27, 2020
Latest reply on Feb 27, 2020 by Shawn Stugard

I often work with sheet metal that needs to be rolled into a cylinder with a formed lip and run into the issue of not being able to Unfold the cylinder to add Cut-Extrude features to its flat pattern that would then be Folded and visible in its rolled state.  See attached.  Why can I Flatten these type of parts, but cannot choose a Fixed Face to Unfold?