• Bugs
  • Change angle of polygon in editmesh

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Here is my problem:
Those first two option is not good for animation so there should be some option which can change the angle of the polygon without changing the vertices's position.
I hope we can upgrade this option into edit mesh menu soon:

Yes. Using the Create tool (the mouse cursor should have a + on it) in Edit Mesh mode, drag from one point to another point.
It will result in an orange line, signifying that it's a user-defined edge rather than an auto-generated one.