OK. So I got it to go away. I went to the new tab/speed dial. Then customize start page, and selected the drop down for the side bar. Then toggled "History" on off a couple of times and it went away.
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Download Opera browser with:
OS X 10.11.6. Opera 45.0.2552.812
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36 OPR/45.0.2552.812
It's showing History on the left side. See screenshot.
Restarted opera, restarted computer.
Still shows. Started happening when opera updated this morning.