It is not possible to convert an existing world to become flat. You’re only able to create a brand new world which is flat.
How To Create a Flat World?
- Head over to the Game Panel and stop your server.
- Navigate to the World tab and click on the Create New World button.

- Name your world anything you want and change the
level-typetoFlat. After that, click on the Create button.

- Done! You can now start your server to generate the flat world.
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If you still require assistance, please get in touch with our support team by opening a ticket or by joining our community Discord server.