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It's just a keyboard shortcut to open and close the message preview pane in kmail, for example using the F8 key.

WHY?


-Example 1:
I have a big list of mails, I'm searching for one, with the preview pane open, the pane list is small and it's more difficult to find some mail.
I prefer, Use F8 to close panel, and now I have a big pane list of mails.

-Example 2:
I have some SPAM and I don't like to select one or more of them and have it open in preview pane.
I prefer, to use F8 to close the preview pane, select and delete.