Four knot modes let you control the softness of a shape on a knot-by-knot basis, as described here:
Icon
Name
Hot Key
Action
Group mode
F1
Moves both the main shape knot and the edge knot associated with it.
Main mode
F2
Allows you to move only main shape knots; edge knots will not be modified.
Edge mode
F3
Moves only edges; you can therefore move the edge away from the shape.
Any mode
F4
Allows you to pick any type of knot.
1.
To create a soft edge, click the Edge mode icon and drag a knot out.
2.
To reset the soft edge, right-click the edge knot and choose Reset Softedge.
Note
Be careful with the soft edges. If you make a shape whose lines overlap, you may get rendering artifacts. To clean up minor artifacts, apply a slight blur with the Blur node.