The Projects feed is displayed in an order of relevance, based on a combination of fresh, applicable, popular and suggested Projects that have been posted on CC recently. Each person sees a bespoke version of the feed, although the best projects will naturally rise higher and appear in more people's feed if they perform well in terms of views and Likes.
You can visit your list of Projects here to see all items, even if they are set to 'public' or 'private', in order to delete them; only you can see this page. Select Delete against the Project that you'd like to remove to wave goodbye permanently to this item. This cannot be undone or retrieved.