Biome hight and oceans (mcreator 2025.3)

Hi, i am trying to make a sort of biome/genaration mod. To do this i have created a new dimension and increased the ocean level for much better oceans, however when I added non ocean biomes (vannila) biomes to this dimension they were submerged under the water, I am happy to create new versions of the biomes (and i was thinking of doing this for most biomes anyway) But i dont know how to have a flat(ish) biome that spawns high up so it would not be submerged. I have done some research but nothing has really been helpfull, aspecially for mcreator 2025.3. Does anyone know how to do this?