Set a value for Draft Angle and create the rib.
Imagine the reference contour extends in a straight line through the model. Outward draft is applied in the direction of the Next Reference arrow (to the left of the reference contour line). Draft is applied perpendicular to the face created by the thickened reference contour.
The opposite type of draft, in this case inward draft, is applied to the model on the right side of the reference contour line.
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