I prefer to have mail preview enabled. But that includes the spam folder as well.
Sometimes the content of a spam email is NSFW, which complicates the processes of scanning spams for any non-spam emails.
So, how do I disable preview for just the spam folder?
I guessed that was the case.
However, it would be very convenient - speaking about this use-case - to be able to put this command (hide messages panel) as a short-cut on the window header, besides of the commands for reply, delete etc.