[HELP] Anyway to set player world, or universe?

Please someone help me… i can’t find one

No such thing. At least as far as I’m aware

any anyway that i can hide other player… and make them doesn’t see me tooo… anyway?

becuz i make a charactercustomization… and i don’t want people to be replace in the same position

You can easily set players “alpha”, I guess if you want you can make your own “world” thing with setting the player visible to other players and not others. (Not fully sure if this is possible.)