To edit a polygon, please follow this actions:
Enable the polygon tool
Click the Edit button on the top bar, or click the 'E' hotkey. The button turns dark green when selected.
- Double-click a polygon’s contour and it will turn grey with enlarged points:
- To shift location: Click and drag any point.
- To add a new point :click a line where a point needs to be added.
- To delete a point: click a single right-click.
Once you are done editing a polygon, click Esc and its contour will appear smooth again.
For more information please go to Polygon