CircuitStudio Creating Components: Unable to add 3D Body

To be clear, there is no library of 3D step models that comes with CS.  You can find your own models at various sites on the Internet.  Digikey often has some and most manufacturers have them.  You can make reasonable and functional models using the primitive shapes.  For example, an electrolytic capacitor is just a cylinder and possibly a box with it.  If you want realistic 3D views then you have to get good models somewhere.

Also, the method to add a 3D body directly to a PCB is not obvious as it is with the PCB library.  In the PCB you can do it from the search box instead of from the menu ribbon.  I think you type in "Add 3D" and the command will appear in the search box for you to select and complete.  Took me a while to figure that out.