Need to find a solution to block indexing topics from a category

[Don]

You can change the category permission to TL0 so only logged in users will see it and also will block bots.

@Discourse

Setting up private categories

You can also make specific categories private:

1. Visit the category page
2. Click the edit button in the upper right corner to access category settings
3. Go to the “Security” tab
4. Adjust the permissions as needed
   
   

In this example, only users with accounts can access the category. Anonymous users are restricted from viewing it.

You can further customize category access by making certain categories readable or writable only to specific groups of users. These groups can be either public or private.