Where does the additional game content go when we install with the mod manager , as all of my playermodels are tposing and i would like to remove a certain folder with in the hl2 extra content

We store the content in a shared folder on each node. These are static and not accessible to you, but you can control which content pack specifically is mounted to your server in the mount file.

Head over to garrysmod/cfg/mount.cfg and remove/comment out any packs you don’t wish to mount.