The "Drawing" menu
- Scale: enlarges or shrinks the drawing by the desired factor...
- Mirror horizontally / vertically: this should be self-explaining ;-)
- Update drawing: If you note something is wrong with your drawing you usually don't need to start all over.
Just change the drawing, then reopen it using "update drawing".
Estlcam will replace the old drawing with the newer version and keep the already created toolpaths...