How to change a terraria server world size

To change your world size, you will need to create a new world since the one that has been generated used the default size (small).
Follow these instructions :

1. Stop your server
2. Go in /saves/Worlds folders
3. Delete the server world files (world.wld and world.wld.bak files)
4. Change the size in the "settings" page
5. Go back to the manage page and click "restart"