Arbortext IsoDraw > User's Reference > Menus > Element Menu > Advanced Tools > Extrusion Tool > Quitting the Projection
  
Quitting the Projection
Click an empty part of the drawing area. The following dialog box appears:
If you click the box next to Find elliptical arcs, all Bézier paths with an elliptical form appear as segments of an ellipse.
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If you want to add to a drawing of a rotational body, you should select this option. Working with elliptical elements is easier and more precise.
Clicking No lets you quit this dialog box and continue editing the projection.
Clicking Yes terminates the projection process. The elements are then projected into their final positions.