Shapes are 3D geometric objects that can be used to create columns, garage slopes, sloping ground, land gradients, window sills, curved walls, curved roofs, and many other architectural components.
Shapes are found in the Materials menu because of how they are customized.
To add a shape:
Click Materials and the Shape from the design menu on the left.
Each shape is resizable and each of its sides can receive any type of material. Each material has a setting for angle and an adjustable scale in the right-hand options menu.