Okay, just a moment ago, before downloading the most recent update, I opened a new project and had an interface that looked a lot like the new version of Mail -- i.e., no drawer but a left pane. When I clicked on "Install and Relaunch" and created a new project after relaunch, I got back the drawer. (And I should note that I have never been a fan of the drawer, so the the momentary new project interface was good news to my eyes.) It's late in the night.