I have a world with Lost Cities world gen (default world gen + rare cities), and I wanted to disable the generation of cities in the overworld. I was able to remove the Lost Cities mod and modify my world’s level.dat file to remove the dimension and datapack so that the world can be run. However, I wanted to keep the Lost Cities mod so that I could keep the Lost Cities dimension and just disable the overworld generation of cities. I couldn’t find a way to do this, though, and I don’t think it’s actually possible currently.

I tried resetting the lostcities-server.toml file in the world’s serverconfig folder to one generated in a world without Lost Cities world gen, but this didn’t do anything, and cities kept generating in the overworld.

I was wondering if you could add a feature to The Lost Cities, perhaps in the form of a config option, that would disable city world gen completely (except in the Lost Cities dimension) so that people like me who want to disable the overworld cities world gen are able to do so without having to get rid of the mod completely and thus getting rid of the Lost Cities dimension.

Figured out the issue. You have to restart the game after changing or deleting lostcities-server.toml. After resetting the world’s lostcities-server.toml in serverconfig and restarting the game, the overworld cities world gen ceases, and you get to keep the mod and the dimension that comes with it! Yay!