Polyline grips offer some grip-specific options that depend on the grip location (vertex or midpoint), the segment type (line or arc), and the type of polyline (standard, curve-fit, or spline-fit.)
Add Vertex. Specify a location for the new vertex.
Remove Vertex.
Convert to Arc. Specify a location for the arc midpoint.
Convert to Line.
Polyline
Curve Fit or Spline Fit.
Polyline
Decurve.