After finishing a round, there’s no way to get back to the dashboard just by using keys. Even when the “Dashboard” button has the focus and is thus outlined in blue, as in this picture, hitting “Enter” does nothing. You need to click the button with the mouse in order to go back to the dashboard. This is especially irritating with the new “categorized”/“fragmented” approach to the “Review” and “Favorites” features, since as things are set up now, one needs to go back to the dashboard all the time in order to get to the next category.
It occurs to me that the “Enter” key might always be reserved for “Next Round” (at least when keyboard shortcuts are enabled, as they are for me). But I would encourage you to have “Enter” go to the dashboard when “Next Round” is inactive.