How to disable posts from showing on category page for specific category only.

That code shouldn't be removing all content.

Can you provide admin login credentials through the Private Information field so we can take a closer look?

Provided in the private section as requested.
At the moment there is code added related to this request.

To clarify, which category of posts are you looking to exclude from the "garage" category page for instance?

Added info in the private section.

Can you re-add the code? I'll check what's going on.

I will give you SSH/sftp details in the private section so downtime of the pages is minimal and you can make the changes yourself.
The site uses a child theme so you will need to navigate to the appropriate folder to access functions.php

Can you add the link to the staging site? Add the code there as well

Please take note that this inquiry is more related to WordPress as opposed to GeneratePress itself. It's not part of our scope of support but we'll do our best to assist and point you towards the right direction.