Can’t manage administrators if only you not a super admin.
In OctoberCMS (Version 3+) you have new logic “Hide users above rank, not including self” but new column sort_order in backend_user_roles is null by default and this logic not work.
$q->orWhereHas('role', function($q) {
$q->where('sort_order', '>', $this->user->role->sort_order);
});
Start working only after manually change ordering in roles section.