How to Change the World Index on Your Core Keeper Server

The world index determines which world is loaded. It must match the number of your world file (e.g. 0 for 0.world.gzip).

Open dashboard
Open the dashboard of your server.
Open settings
Navigate to the Settings.
Enter world index
Enter the desired number in the World Index field.
Restart the server
Save the setting and restart your server.

Example

If your world file is named 3.world.gzip, the world index must be 3.