Put some kind of connection string generator / link / text on the "Database Access" screen
It took quite a while for me to find a template connection string for Atlas, as I only thought to check the "Database Access" screen. Eventually I found the "Connect" button the "Clusters" screen, but it was a pretty frustrating time looking for something as essential as a connection string.
It would be great if you added something that would have prevented that-- a little widget where you pick your cluster and it spits out a template string. Or even just some text like "Looking for your connection string? Go to clusters, it's over there!"