here are two types of segments: straight and curved. If you click on a node with the Shape tool, the Status Bar displays the type of segment entering the node and the node type itself, for example, Selected Node: Curve Smooth. The Convert Line To Curve and Convert Curve To Line buttons make it easy to turn segments from straight to curved and from curved to straight.
You can also change the direction of a curve and smooth out a curve using buttons on the Shape tool Property Bar.
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