Category in Advanced options dialog box: Concrete detailing
When this advanced option is set
TRUE, which is the default value, Rebar shape manager recognizes and uses the polycurve geometries of reinforcing bars.
Polycurves can consist of straight and curved segments.
If this advanced option is set
FALSE, polycurve bar geometries are recognized as polylines and
may result in polygonal chains of short bar legs.
This advanced option is model specific and the setting is saved in the options database.