edit: I'm dumb I realized I could just press "l" and manually add in the mechanical layers I need
I have a few .PcbLib documents, and all but one of them I am able to select lines, polygons, extrusions, etc and set them to any layer I want with no problem. In this last document, when I select the "layer" menu under properties it only allows me to select mechanical1. The other options are not there.
Here is a picture of one of the files that works:
And here is a picture of the issue in question:
Is this a setting that I changed on accident? All of my other .PcbLib files do not have this issue.
(I am using a 3D model as an example because it only shows mechanical layers but other things like lines and pads also only show mechanical 1)