I can't stand custom drawn windows because they break standards that have been in place on the OS for ages. I submitted a request to Vivaldi to please give us an option for a native window that shows the full window title area instead of custom drawing the window.

I doubt that they're going to offer an alternative mode because the developers seem more concerned with making their own custom behavior instead of just fitting in with my OS. They did a lot of work to break the functionality of a native window.