How to remove the flagged mailbox in MacMail
I flagged an email for later review which created, for the first time, a Flagged Mailbox on the left side bar. Now, I regret having done this as there's little enough space on my 13.3" MBP for another, seldom needed, mailbox. Is there a way to remove this mailbox (the delete mailbox option is not available via the menu bar's Mailbox tab).
MacBook Pro with Retina display, OS X El Capitan (10.11), CSI's MBP 13" (2015)