Well, as I explained earlier -- that's not a "problem" per se, it's an intentional part of the site design to ensure people don't miss out on important announcements. It intentionally can't be filtered out in the way you're asking for it to be. The above workaround is the closest thing I can offer you in terms of a solution.

With that said, there's nothing else to be done in this matter if the above does not work for you. I'm going to leave the subject at that. If you need help with anything else please private message me or another member of the team, or make a new ticket if you require site support or would like to request other features.