N-Panel -> Edit -> Mesh Analysis Overlay
- Triangles
- Quads
- N-gons (5+ sides)
- Non-planar faces
- Degenerate faces
- Non-manifold edges
- Sharp edges
- Seam edges
- Boundary edges
- Single vertices
- Non-manifold vertices
- N-Poles (3 edges)
- E-Poles (5 edges)
- High Poles (6+ edges)
- Overlay Offset
- Overlay Edge Width
- Overlay Vertex Radius
- Non-Planar Threshold
- Quick selection buttons for each overlay type
- Shift-click to add to selection
- Ctrl-click to subtract from selection
- Statistics display for active overlays
