How to remove standard structures?

Hi!😄 So i've downloaded MCreator not very long ago and I was wondering if there was any way of remove all of the existing structures to make a general overhaul mod and didn't find what I was looking for soooo... decided to beg for your help! 😅

I'm absolutely new to coding and this is why I've downloaded MCreator, but now I think I need some code... 😑

Can someone help me please? 

I've found this bit of code, wich I think turns down the ores as an example (very very bad at coding): https://github.com/Luis-st/Forge-XGeneration/blob/f63b16373b645c025df5366db131dbc6bea1d464/src/main/java/net/luis/nero/event/generation/OnBiomeLoadingEvent.java#L47

Idk if it can help 🤷

Thanks for having read! 👍