To remove the redundant vertices of a polyline, reducing its vertex count (it does not work on hatches), go to the ribbon: CapCad tab › CAD Utilities panel › Geometry split button › Polyline Utils. In the window that opens, the Modify tab, choose Remove redundant straight vertices and click Ok.
The command then asks you to pick one entity. Every intermediate vertex whose two neighbouring segments are straight and run in the same direction — within the tolerance in Angle precision: (in degrees, 1° when the box is empty) — is dropped. A vertex whose incoming or outgoing segment carries a real bulge is never removed, so an arc is never flattened into a line.
The picked entity is erased and the simplified copy is drawn in its place, and the command reports how many vertices it removed.
See also
- Curve Utilities — the whole seven-tab window this option lives in, and the rest of what it does to a selection of curves.