About Deleting Mesh Elements
In Freestyle, you can delete single, multiple, or loops of mesh elements, or an entire shape. You can delete the following mesh elements:
Faces—When you delete a face, a hole is created on the surface.
Edges—When the edges are deleted, the connected vertices are not always deleted. Such vertices with only two connected edges are called doublet vertices or doublets. Doublets must be resolved by deletion or other techniques to complete a feature.
Vertices—You can only delete those vertices that are shared by two edges. In other words, you can only delete doublets.
Shape—You can delete an entire shape. You can select a shape or all mesh elements of a shape to delete it.
If a shape becomes disconnected after deleting its mesh elements, the shape is split into two or more shapes.