I suppose you are right. In KDE (I have XFCE with Kwin) in Aliya Linux, that is based on Debian Stretch and in KDE Neon (Ubuntu), the menu is quite nice and I can have no border. In Ubuntu with Openbox (Nelum Openbox), also I can un-decorate. In Devuan (Nelum-Dev-1 Testing), it can also un-decorate. If the Ubuntu based distro has Gala Window Manager, it can't. Once there is no border, the minimize and maximize buttons go away. This doesn't happen in Windows 10. Maybe, the Opera devs take heed. I'm now using Opera Beta, for in a few days, it'd become 45 final.
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