Curve

•Insert point: Inserts a new control point.

•Remove inner control points: Removes all inner control points of the control polygon so that Line/Arc Segments curve reduces to a line.

•Split curve: Subdivides the Line/Arc Segments curve into two curves while trying to keep the shape of the original curve.

•Offset curve: Applies an offset to the curve underneath.

•Duplicate/ Copy/ Save curve: These general features are described in the topic Graphical dialogs.

Circle center

•Edit edge radius directly.
If there is no radius available at the control point initially, then the context menu of the control point can be used to define a radius.