How do you hide invisible users?

[A Former User]

So on my forum, if you check which users are online, you can see people who have set their status to "invisible". When I try this on community.nodebb.org, all the invisible people disappear!
Does this witchery come with magical CSS? And if so, what are you doing?

[baris]

Admins see users even if they set their status to offline.