Mob spawning issue

I started making a mod at 2020.5 version of Mcreator. Some weeks ago I decided to upgrade my mcreator version to 2023.3 not long ago and fix some issues of the mod as a hobbie. I had a problem back at 2020.5  which was that any hostile mob spawned naturally at night on any biome and I came to the conclusion that I can crate another workspace in which I dont change the mobspawning files, but fot this I need to know which is the file a need to replace to fix the matter, help will be appreciated.