Click
Edges in the Style group on the Display tab.
Select any combination of the following options:
The examples below
show each option disabled and then enabled.
Tangent: Display lines indicating tangent
edges and edges that do not span a face.
Surface: Display all edges on surfaces.
Solid: Display all non-tangent edges on a
solid.
Silhouette: Display the lines that indicate the
silhouetted edges of all curved surfaces. This option affects only
Wireframe, Hidden Line, and Hidden Line Removed graphics styles.
Mesh: Display facet
edges on an STL model. You can toggle the display of internal mesh edges and
open meshes edges on boundaries. You can sketch on the mesh object and your sketch tools will
snap to the facets.
Soft: Display the soft edges of imported
SketchUp models. This option is ON by default.