The two variants are found in the Traditional digitizing toolbar in Designing and the Graphic toolbar in Decorating.
The input method is clicking on either side of a column, beginning on one side, and clicking the other side to determine the width of the column, then moving alone the column and returning to the first side to the 3rd click then opposite to the other side for the 4th click repeating the process using left or right mouse clicks to determine sharp corners or curves.
To complete the shape hit the enter key once
The tool is used to create columns of stitching that vary in width and can be complex curves.
As with all tools in Embroidery Studio, left mouse clicks create corners and right clicks create curves.
If you left click instead of right click continue on, this can be changed later by selecting the offending node in reshape mode and hitting the space bar to toggle from a left to right click and back again.