In the design panel, pick a part and its values appear in the child panel beside it. Click a material sample to swap the three base colors, then shape the surface with the finish, reflection, scratches, dents, rust, and pattern. Sub-groups such as cloudiness and the second light open one panel further out.
Drag the plate to move it and use the wheel to zoom. The zoom level sits at the bottom right. Drag a panel by its header, and double-click its title to switch how panels are laid out. The file panel adds projects and exports PNG, JPEG, or WebP.