On the Generative Design tab, you can create an implicit or a B-Rep (boundary representation) geometry. If you create an implicit geometry, you can reconstruct the B-Rep geometry later from the Generative Design feature.

Right-click the Generative Design feature in the Model Tree and select Reconstruct. The reconstructed geometry features including the Freestyle feature are created in the Model Tree.

You can manually attach the reconstructed B-Rep geometry to the hybrid body in the Attach mode. In this mode, you can attach specific vertices to create a geometry that is closer in appearance to the hybrid body. For more information, see To Attach the Freestyle Geometry.