I've seen so much Haunted Cabin/Barn in my world and it's really annoying. I couldn't see a config option to change rarity so it would be nice if us can determine it's frequency

what version are you using? the one with corn? if so i did increase its rarity quite a bit. Anyways structures are data driven and can only be changed with datapacks

Increase

How can i lower structure spawn? Should i decrease spacing and seperation?