Is there a way to disable the Categories in the Spawnmenu like the Weapons (for a Usergroup)?
I strongly advise you not to modify it if you are not familiar with Garry’s Mod environment, it’s very complicated to modify the spawn menu components in general.
I’m pretty sure that the spawnmenu mostly uses a list for stuff like that so a good starting point is looking at the spawnmenu code and see if and what list is used and then just remove the category from said list.
Don’t forget to reload the spawnmenu after removing it. (running the console command spawnmenu_reload)