In PathFinder, expand the Sketches collection.
Position the cursor over a sketch name so that the sketch geometry highlights in the graphics window.
In PathFinder, right-click the sketch name and choose Delete.
All sketch geometry is removed from the graphics window, and the sketch name and node are deleted from PathFinder.
Tip:
You can use the Undo command located on the Quick Access toolbar to restore the sketch.
To delete one or more sketch elements, select them using the Select command 
.
There are a variety of selection filters available.
Press the Delete key.
Tip:
If you delete one element that forms a closed region, the entire region is deleted.