Hiding player names

[_Sophie_]

Hey all, I’m trying to create a game room, but in order for it to work, players names need to be hidden. How can I achieve this? 
I’ve been in a few rooms where names are hidden so I know it’s possible, but I have no idea how and sadly google brings up no results.

 

any help would be appreciated xx

[GottaGo]

Your room should be located under -7meters and you need to move the sea level under this as well.

The name will then disappear