i tried to create to create a world with only the ocean biome.
So i thougt that i can simply disable all other biomes. But i was wrong. I got a World with Islands everywhere.
After a few hours of writing with @minelazz he found a solution for the problem. Modify the Birchforest Biome....
If anyone want a Waterworld here is the setup:
All other biomes have to be disabled.
ps: Sorry for my bad english