Option for showing one categorie on home page

Hello,

I am looking for an option that wil allow me to set one catagory to show on the main/home page, still the categorie list remains but the start page only shows for example the “General” Categorie.

I found from kitten plugins:
https://mookitty.co.uk/devblog/category/show-categories/

But i can’t find any plugin or code there.

Thanks for any assistance
G