Clean Sketches (Model Assistant menu, Part ribbon) deletes the broken projected geometry left in the sketches of the active part: curves and points whose original face, edge or component is gone. It covers every 2D and 3D sketch of the part. Ordinary sketch geometry is never touched.
- Model Assistant first counts what it found and asks before deleting anything.
- The clean-up is one undo step.
- Geometry that a feature still uses is left in place, and Model Assistant tells you if nothing could be removed for that reason.
- If the part is read-only, its sketches cannot be changed.