You bring up a good point, IMO: the "Open in Data Viewer" button is far-too obfuscated. If I hadn't used Enigma before, and hadn't already known what was contained in a previously-visited dataset, I too would have assumed that I hit a dead end because the button was the last thing I noticed on the page.

The horizontally-flowing layout is problematic overall, but placing that "Explore Data" button much higher in the right-most column would be a decent compromise: http://imgur.com/a/lS7ks