[xwiki-users] Restrict Access Rights to Admin Users only

Hi I’ve noticed that users with edit permissions can also modify access rights on any document. Ideally what we need is that only users with Admin rights can modify document Access Rights in their space. The reason for this is that we only want to allow department heads to be able to make a document visible to other users/spaces, but we want everyone to be able to contribute to the articles. I am slowly trying to learn the power of XWiki and am loving it so far. Any help with this would be greatly appreciated. Thanks in advance for your time. Kind regards, Mahomed