I see that the previously reported issue is still occurring. After reinstalling the system, I installed the latest version of Opera, reluctantly accepting the rounded-corner layout (especially the webpage display area with rounded corners on the left). Now there’s another problem with DevTools — I have to keep disabling and re-enabling them after refreshing the page, because the page content goes under the DevTools window.
I guess it’s time, against my habits, to switch browsers or go back once again to Opera 99 — in my opinion the last true version of Opera.
Opera One(wersja: 121.0.5600.38)
System: Windows 11 64-bit
Wersja Chromium: 137.0.7151.122