I've just recently started designing my first PCB using Altium but am confused with the mechanical layers. I have a 4-layer board, and am placing components on both the top and bottom side (Through right-clicking and settings the component layer). This properly assigns the pad, solder, and overlay to the layer I choose, and if I go to 3-d view everything looks right.
However, I've noticed that both the courtyard and the body information (layers 13 & 15 by default) for each side were put on the same mechanical layer. So I enabled their respective pairs (layers 14, and 16), and configured them to be pairs of the already existing layers. But I'm not sure how to actually assign the bottom layer components to have their courtyard/body information on these new layers. I've tried setting them to the top layer, and then back to the bottom layer to see if now that I've configured the new mechanical layers it would just automatically assign them to those, but that was not the case. How do I do this?