The Project Tree is located on the Project panel and contains items to manage the model's vectors, bitmaps, reliefs, toolpaths, and toolpath simulations, and to control their display in the 2D and 3D views.
Layers
By default, the Vectors,
Bitmaps, Front
Relief, and Back Relief items in the
Project Tree each contain a default layer, on which all vectors, bitmaps, and
reliefs are created. To help organize your 2D and 3D designs, you can create
multiple layers, which enable you to group individual vectors, bitmaps, or
reliefs.