Shape behaviors are applied like any other behavior in Motion.
Do one of the following:
From the Behaviors section of the Library, drag a Shape behavior to a shape, mask, or paint stroke in the canvas, Layers list, or Timeline.
Select a shape, mask, or paint stroke in the canvas, Layers list, or Timeline, then select a Shape behavior in the Library and click Apply in the preview area.
Select a shape, mask, or paint stroke in the canvas, Layers list, or Timeline, then click Behaviors in the toolbar and choose a behavior from the Shape category.
Note: When you apply a Shape behavior to a simple shape (a shape without control points), a dialog appears asking if you want to convert the shape to a complex shape with control points.
The Shape behavior is applied to the shape, mask, or paint stroke.