For more, see Draw Tools, Edit Polygon Features
To activate: (in Edit Layer mode) Toolbar
Create polygon features such as parcels, building outlines, or tax districts.
To use:
Activate Draw Polygon tool.
Click on map view at desired beginning location.
Move pointer and click at each desired break / corner / vertex.
Right-click and select End Feature to finish.
To undo the last drawn vertex while drawing a polygon feature, right click and select Undo Vertex.