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I don't see any settings for this. I would love to use the full width for reading a mail message.

There's a button with two arrows pointing outward. Tapping that will zoom the email window to full screen. It'll go back to two column mode when you tap again.

But no way to close out the two column view when showing the list view.
 
There's a button with two arrows pointing outward. Tapping that will zoom the email window to full screen. It'll go back to two column mode when you tap again.

But no way to close out the two column view when showing the list view.

oh, I missed that expander thing. That's good enough for me. Thanks!
 
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