First of all, sorry for my english, I'm french !
So..

I have a problem with my browser, it seems that a "ghost zone" in the upper left corner prevents me from clicking on the first two tabs or on the buttons in the side bar. It's as if a transparent window was superimposed on my browser. I tested on other browsers and the problem does not appear. I also made an opera recovery, and the problem still persists. And this even when I disable the extensions. I have the latest version of Opera Version :71.0.3770.148. I'm running under Windows 64.

Thank you for your testimonials and your help.