Leo comes with a brand new feed analytics panel to give you insight into your feeds.
You can find this by going to your feed (category level, not source level) and clicking the Analytics tab found above the list of articles.
This tab will give you an overview of how many articles have been prioritized vs. not, as well as insight into how many articles you are marking as read, saving to boards, or reading.
You will also get a list of top 10 topics that Leo has detected in your feeds. This gives you insight into what topics you are most interested in vs. those you spend little time reading. If you hover over any of the topics in this list, you will be able to prioritize or mute them directly from this page.
Last, this page will show you how many duplicates have been removed from your feed so far.