Yes, even more annoying is that the sidebar can autohide, like when you open a full-screen window. They just disable that ability otherwise and provide no way to enable it. I'm not a Mac user, but I was under the impression you could even hide the dock in OS X?
It's autohiding for me, and I don't think I did anything to it. Though, it might just be a bug, I've run into a handful of near showstoppers in the last few days.
edit: Though, now that I think about it, when I first installed, I got the sidebar not autohiding with fullscreen apps, so that it blocked the left inch of whatever was up. Annoying as hell.
