When I checked Members - Current visitors - Members, I could monitor what members are doing and which threads they are reading. Is it normal for registered users to have such insight? Shouldn't that be reserved for admins and mods? Are there any privacy settings that would disable showing this info to others?
Ah, that is my mistake. The ability to view online activity like that is enabled by default in XenForo. You can see any members who have not specifically removed the checkmark from the "Show your current activity" box in the User's - Privacy settings screen. When we first went live on XenForo, I restricted that from showing at all, except to forum staff. However, that specific change has to be made in the Style package. And, I forgot it when I made this new style. I have just fixed that now. It no longer shows.