There are two ways to sort your mentions, both located just above the search bar at the top of the feed.
A sort option that allows you to choose whether you want to view your mentions by:
A reorder mentions in the feed option in the form of an arrow that sorts mentions from highest to lowest value (by default), depending on which sorting option you choose – when clicked, the order is reversed.
To elaborate further on the Published time vs. Last added, it’s a simple choice that allows you to see mentions as they were chronologically published or as they entered your feed. The latter enables you to easily keep track of all mentions you didn’t yet check out, as they will be located at the top of your feed. That way, you’ll ensure you don’t miss out on anything!
Note: This option helps you sort the feed and the mentions in it in the desired way, it does not change your queries and filters.