I just finished installing macOS Mojave on a brand new 2018 MacBook Pro.
One of the first things I usually do is disable all unnecessary fonts.
This time, the option to disable the font is grayed out for every single font.
In the Finder the file permissions are as follows:
system: Read & Write
wheel: Read only
everyone: Read only
How can I disable fonts in Font Book on OS X Mojave?