Have you seen this setting?
Apperance -> Window Appearance -> Use Native Window
https://www.dropbox.com/s/d4ew5ptyusm4cjb/Screenshot%202017-...
You can also choose between horizontal menu on top, or "Vivaldi Menu" in the top left.
Re:Vivaldi – A Browser for Our Friends
by fredoralive on Friday January 06, 2017 @06:53AM
(#13335623)
Doesn't work properly on Windows, you just just get a blank title bar with only the window controls at right (not even the window icon / menu on the left appears).
Does work correctly on Mac OS though.
http://puu.sh/tcYJ7/b7479e05cd.png