Re: Can we hide or delete pre-made sims in Sims 4?

Do you mean in the gallery or the ones that populate the world ?

You can't the ones in the gallery and I'm not aware of any mod (but haven't kept up)

In town you can just delete them through the household manager but the game will keep creating new ones. There's a mod for fewer townies but I don't know if there's one to get rid of them completely.