Put a "Mark All Read" button at the bottom of the article listing in Split View

When scrolling through a long list of articles from one feed in the split view, if it’s longer than the screen, once needs to scroll all the way back up for hit Ctrl-A to mark them all read. Another “Mark All Read” Button at the bottom, like the one at the top would be helpful and save time. Maybe it could be incorporated into the sun-like panel end mark.

Thanks - Great service!