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.
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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.
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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.
Interface
- Yes
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Closes the curve and ends curve creation.
- No
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Keeps the curve open and does not end curve creation.