Is this a windows config issue or an option i missed out in Opera?
Vivaldi has it, so it must be out there somewhere...
Vivaldi and Opera are completely different. Opera has a title bar, Vivaldi doesn't. Depending on your window manager it may be possible to remove the border and title bar, but it would be different in KDE versus Gnome versus LXDE ...
Working on LinuxMint.
Have been looking there for Windows Management but can't find it.
Perhaps i should post over there...
Post in the Cinnamon subforum: https://forums.linuxmint.com/viewforum.php?f=208