Contents created by drawing tools can be edited after creation. Add more detail to your design by editing control points. An object you created keeps its own editing history.
Enter/Exit Edit Mode: Grab an object and press Blue button on your non-drawing hand. Press again to exit.
Control Points Manipulation: Grab, move, copy, delete, and scale away in the same way as you do with normal objects. Increase Grabber size to grab more points at once.
Add Point: Half-pulled trigger shows a preview of the point you will add. Fully pull the trigger to confirm the position.