This looks similar to my issue with Outlook.com -- which replaced hot mail -- and add blocker. I can use Edge or I can uncheck the Opera Setting Block Ads -- not the best solution.
Best posts made by bobhogan33
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RE: Is Hotmail (Live) being sabotaged on Opera for Windows PCs?Opera for Windows
Outlook.com and ad blockerOpera for Windows
With ad blocker turned on navigation buttons disappear reading email messages using Outlook.com in Windows 10. I'm using 38.0.2220.29. Would it help to update? How do I do that?