Why any user can view all the contacts belonging to other groups?

[devnull]

@ErikUden

None of my users are in any group and there is only one admin (me). Normal users can see all other users too, which is problematic.

@Colt

It takes control away from the admin if the users can all see each other many reasons why at home or a business would want this on by default.

Perhaps this also helps here.