Remove Ediff buffer highlighting to restore normal editing mode

Heime <[email protected]>
Newsgroups gmane.emacs.help
Message-ID <QB5NYa3SAgAlzMBB-hqqVWswe0ihLYr6C25Q6Wne_xJISEXdcXFKeXkeBaw4SXDZXfM_qtVYIGdVh_4A00HILb92cCLQjLqwiPmxaZjHGUg=@protonmail.com>
After I use "Tools - Compare (Ediff) - Two Files" I get some of 
the buffer background highlighted.  How do I resume normal operation 
without the highlighting?
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