How to play fortnite hide n Seek?

I often see on YouTube that some in Fortnite hide n Seek play so turning into an object and other players have to look for them how can you do that. I know how to use a map code but I can't play hide and seek on these maps or I do not know how to do that.

You have to join with some friends on one of these maps (best 4) and just press start. Then there's a viewfinder and the rest are the Hider.Das most important is just that you have teammates

When I start it's just like a deathmatch

I play with 2 so my brother and I

6069-9263-9110 the code had to take XD