I have this problem too. This is the only reason I switched to Opera. But with this gone, I think I'm going to switch back to Chrome. Sorry Opera 
FYI, I did not install any extensions. The button just disappeared recently.
Posts made by joeflack4
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AI tools: Sidebar, Prompts, AI tooltipRE: Everything AI related is gone
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Suggestions and feature requestsRE: Have bookmarks bar only show in newtab like Chrome?
Speed dial can basically do this, but I'd prefer to toggle the bookmarks toolbar instead. I think that's better. Plus it would work with my Firefox bookmarks I just imported. Don't want to have to reconfigure all of that into Speed Dial.