How to restore the content window in Apple mail?
On OS 10.8.4, I had Mail set so a window at the top of the list of messages in my inbox showed the content of the selected messages. This morning that window mysteriously vanished. Now I just see a list of messages, and by double clicking on any message, the content opens in a separate window. How do I restore the window in the top of the message list?
iMac (27-inch Mid 2010), OS X Mountain Lion (10.8.4)