Make the polygon tight around the object
You need to select a label before starting a polygon
You will need to select a label again after completing a polygon
To select a polygon, you can click on its borders
You can start drawing a polygon from inside another polygon
You can undo and redo while you're drawing a polygon to go back and forth between points you've placed
You are prevented from drawing lines that overlap other lines from the same polygon

Draw a polygon around each of the requested target(s) of interest

Make the polygon tight around the object