Go to “Manage,” “Category Visibility” to see the visibility settings for all categories. the options are:
Front: Posts show up on the main (home) page.
List: Categories that will show up in the List of categories in the sidebar.
Search: Posts show up in search results.
Feed: Posts show up in the main RSS/Atom feed.
Archive: Posts show up in archive links (i.e., clicking on the calendar links)