How to prevent a category from showing

You want to stop the posts in the category from showing up in the lists of posts? Or you want the category to not show up in say, a list of categories? Or both?

I need a category that shows up in the loop when its called, but never in any list pages or anything – it shouldn’t appear to anyone using the website from the frontend.

Here is an article that goes over how you can exclude a certain category from different parts of your site.

You could also try this plugin, or this one.