How to Configure the World Border Size and Enable Looping
Finding the Config File
After installing the mod, a config file is generated in your config folder. Open it with any text editor. The main settings you'll care about are the border size values for each dimension and the toggle that enables looping behavior. Look for entries that define the overworld, Nether, and End border sizes separately, since each dimension can have its own limit.
Setting Your Border
Set the border size to the number of blocks you want from the center outward. If you want a smaller world for a tight community server, use a modest value; for a large survival world, increase it. Enable the custom overworld border option if you want the overworld to use its own value rather than a shared default.
Turning On Looping
Find the wrap-around or looping toggle and set it to true. With looping enabled, walking past the positive edge teleports you to the matching negative coordinate on the opposite side, and vice versa. This keeps the world finite on disk while feeling endless in play.
Applying Changes
Save the file and restart the game or reload the world. Borders are invisible, so test by walking toward where you set the limit and watching for the mod's proximity messages.