@jimunderscorep Thanks, I solve the problem.
First I installed from Ubuntu repository that have only snap version 👎🏼
Now I installed .deb from Opera website and it work fine 👍🏼
In this developer release there is a flag in opera:flags (opera://flags/#opera-doh) that enables DNS over HTTPS (DoH) through Cloudflare’s 1.1.1.1 server. It is still experimental but please turn it on and let us know about your experience. Note that if requests can’t be handled by Cloudflare, we will still fallback to your local DNS server. This is so you can still use Opera on internal networks or behind firewalls.
@jimunderscorep Thank you friend, it was 100% right !!! I downloaded the file directly from the official site and the mouse theme was the same as the KDE system.
Context-menu –Right-clicking Opera Icon in Gnome Desktop– is expected to be exhibited according to system language currently in use, here Finnish for instance.
@jbhughes54enwiler I just tried redownloading and reinstalling Opera. No dice. My passwords are syncing on my other Linux PC, what's going on with this one?