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For MC 1.21.5 this is done via /funtion kattersstructures:gamerules/ [name of rule]
For MC 1.21.6+ it can be found in the new Dialog Menu found under /function kattersstructures
For MC 1.21.6+ a new FAQ Button has been added to the pause menu, housing useful information
The Deep Blue Portal generation has been changed: Portals now will spawn in the opposite dimension in a defined y-Range, and not at translated y-height. Solving portals spawning in bedrock This means, that all portals have to be broken and rekindled to work again.

Adds 30+ brand new vanilla like structures to the game