* YOU NEED AT LEAST 1 CONTROLLER *
1) Launch this modpack two times
2) Make two offline accounts using In-Game Account Switcher
3) Log into the accounts
4) Set-up Controllable on both screens
5) drag both screens to your liking Press Windows Key + Arrow to Snap the screen your on
6) Make a world
7) Esc -> Open to LAN
8) Join LAN world on second screen
You can play with 2 people on 1 controller, or 1 KVM and on controller its up to you
If you are going to use Joy-Cons, you will likely need the tool "BetterJoy" to connect them.

