Hello,
Win 10 64-bit, Opera v 81.0.4196.60.
I can't get rid off the annoying tabs list popup.
It appears when you hover mouse pointer over one of the opened tabs (follow the link down below to see a screenshot).
I tried to look up the option of disabling it in setting, and I was googling up the issue as well. But, I couldn't find nothing.
Here's the screenshot link:
https://photos.app.goo.gl/nH5BXZXcdNSVkHka8