Move Polygon Handles Mode
Select this mode to reshape a 2D polyline or polygon by moving one of its vertices.
 
1.
2.
Click the 2D Reshape tool from the Basic palette.
3.
Click the Move Polygon Handles mode button.
4.
Any object that cannot be reshaped with this tool continues to display standard bounding box handles only.

Editing 2D Objects : Reshaping Objects : Move Polygon Handles Mode

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