Yikes! I just tried this on my Windows 10 VM, where I don't run Opera that often, but which I always keep up to date. I enabled the Quick Access panel feature and again, it didn't work at all. Did you guys introduce some bug or something that breaks it unless one already has it enabled?
In the end, it's just a convenience thing anyway. I still hope there's some sort of fix to make it work again, I've grown really accustomed to having this panel around. If not, I guess I'll work around it