Tap the box name
Tap the mailbox name on top to change the view. Not have to go to the menu. Look at Sparrow

Thanks for the suggestion! While we are huge fans of Sparrow, this is one of their features we decided not to employ. The slide-out navigation pane makes the most sense for the moment since it is what many other apps (not just email) use. We may revisit this in the future if we get more requests for it.