Go to the settings of some topic and check “Suppress category from latest topics.” then post something to that topic. It is correctly not shown in the Latest tab, but when you open the RSS feed then it contains the post.
You can set a list of categories that are muted for all new users on your site by adding the categories to the default categories muted site setting. User’s can override this setting on their categories preferences page.
Muting categories for existing users can be done from the site’s rails console. There are details about how to do that here: (Obsolete) Set category tracking level defaults historically. To update category tracking levels for sites that are on our hosting, get in touch with our support system and we’ll make the change for you.
When trying to add a category to the default categories muted site setting and then saving, it looks like the UI already supports applying the change historically:
