How to Make a True Single-Player mode in UEFN?

[Mineblo]

You are correct @yus56 Setting the Max Players to 1 would mean that every session/server/game instance or however you prefer to call it would have a MAXIMUM of 1 player in it, meaning no other people can join, as for

Will it allow multiple players to launch the game separately, each in their own single-player session

Yes it will every player will be placed on their own seperate session