What is Skin Swapping?
Fortnite skin swapping is editing Fortnite's game files to get a different skin/backbling/emote/pickaxe/etc.
In Pro Swapper, there's 2 types of swapping. There is swapping items ingame and swapping items in lobby.
Ingame swapping shows your skin ingame but only to yourself and not others.
Lobby swapping shows to others but only in the lobby.
You can swap in lobby and ingame at the same time and other will be able to see your skin in lobby but only you will see it ingame.