Everything about the Opera browser is beautiful, except for the corners of things like tabs, bars, speed dial shortcuts, windows, etc. I seriously wish there was a way to change it to be simple rounded corners or boxes with no rounding at all.
I currently use both Opera for Windows (116.0.5366.35, Windows 11 64-bit) and Opera for Android (86.6.4550.82781, Android 15) and have this issue on both of these versions.