Command entry: Create panel (Shapes) CV Curve button In viewports, draw a CV curve and click to create a CV in the same location as the first CV in the curve.
Command entry: Modify panel Select a NURBS object. NURBS toolbox (Create CV Curve) In viewports, draw a CV curve sub-object and click to create a CV in the same location as the first CV in the curve.
This dialog lets you create a closed CV curve when you click to create a CV in the same location as the curve's first CV.
Interface
Yes
Closes the curve and ends curve creation.
No
Keeps the curve open and does not end curve creation.