Why am I unable to configure the settings "Item Spawner" and "Free Crafting" when creating a new LEGO Fortnite Odyssey world?

These 2 features are built-in into the game mode you choose when you start a LEGO Fortnite Odyssey world and are not customizable.

• "Item Spawner" - Will allow you to spawn items from the catalog.
• "Free Crafting" - Will allow you to build items and craft for free.

Since these features are only intended for Sandbox, they are "On" by default when you create a world using the Sandbox template, but are "Off" by default when you create a world in any other game mode's template. 

Warning: enabling these features will disable progress towards quests in your LEGO World