I was just about to post that I was having the same problem with build 84.0.4316.42 on macOS Sierra, but I updated to Opera 85.0.4341.47 and it's fixed now. 
Best posts made by salaryfar
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Opera for MacRE: Opera for Mac is crashing topic
Latest posts made by salaryfar
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Opera for MacRE: Opera for Mac is crashing topic
@jude888 What macOS version are you using? I have no problems with the same Opera version on macOS Sierra.
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Opera for MacRE: Opera for Mac is crashing topic
I was just about to post that I was having the same problem with build 84.0.4316.42 on macOS Sierra, but I updated to Opera 85.0.4341.47 and it's fixed now.