Me too!
I want my choice of system font to be respected! The new one is far less functional since it takes up more space and shows fewer characters in any space where this is limited, such as tab labels.
I just updated to version 103, and I think the splash screen also has a new uglier, more primitive split apart Opera icon replacing the beautiful, top-tier 3-D version shown before.
Please at least give us an option to revert to the classic interface!
I usually hold off on updates, but I feel unsafe doing this for my Web browser on my main device.
I've liked Opera a lot, though this also makes me feel I should consider returning to Brave or trying Vivaldi...
Appreciate your consideration.