When I browse through my emails in Thunderbird I like to be able to quickly scroll through previews of the messages. But every one in a while the “email preview” disappears.
To get the email preview pane back in Thunderbird simply:
1. Go to View ->Layout ->Message Pane
and your email preview will be back.
![thunderbird_messagePane Restore the Message Pane in Thunderbird](https://www.helpspa.com/wp-content/uploads/2011/04/thunderbird_messagePane.gif)
(You could also just hit the F8 function key to do the same thing.)