@sylapa There are a few websites that see "Opera" and decide you are probably using a mobile device pretending to be a desktop, especially if they see you're on Linux (Opera for Android will identify as Opera for Linux if you set it to identify as a desktop system) - but that is only a few sites.
@leocg The whole situation concerns the browser, but in English everything works perfectly, unfortunately in the browser with the Polish language something is wrong here, the installer with the Polish language is broken, if we want to fix it, we first install the English version and in the settings we change the language to Polish and everything works, the problem loose.
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@leocg
yes, several... after you asked about pinned tabs, I tested it without pinned tabs and it works again fine. I should add however, prior to the current Opera version, it worked fine, even with pinned tabs (i depend on them).