EditCompositeRegion - Interactive Graphics Mode
In addition to the regular features of Interactive Graphics Mode, the EditCompositeRegion has a right-click menu which lets you graphically Add Subregion, Remove Subregion, or change a Subregion Operation.
Tip:
When working with polygons in Interactive Graphic Mode, you can grab and move points as well as add or remove points along the shape's edge.
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When the mouse is over the shape's edge the cursor will change to an arrow with "+" which lets you add a new point. | Clicking on the point to move it to a new position | Use Shift + Alt and click the point to remove it. |