To create a diagram of your rack, first open a Project. Note that diagrams are only available if the root type of the Project is set to Rack.
Then, in the toolbar, select Diagramming > New Diagram. This will open the diagram menu. Here, you can select from a variety of procedurally-created diagram presets, such as Rack Layout, Center of Gravity, and more.
Additionally, in the Individual Appliance section of the diagram menu, you can generate a diagram of each individual appliance. You can also generate a connection diagram per appliance. This diagram shows how each appliance connects to all other appliances in the Project.