Unwrap and Flatten Faces

Unwrap and Flatten（Unwrap and Flatten） Animation Tutorial
Select non grouped geometric objects. After setting parameters, the face of the selected object will be expanded directly, flattened to the axis horizontal plane, and automatically grouped.

Smash (project)（Smash (project)）
Select non grouped geometric objects. After setting parameters, the selected objects will be flattened directly and projected onto the axis horizontal plane, and automatically grouped.