I hate this, and the general trend. At least, on GTK apps, you can disable the min/max/close buttons. Now the window looks like Windows. It also has two useless buttons, since I'm running a TWM there's no "minimize" nor "maximize". I could already not show a title bar if I wanted, now I can't get rid of the useless buttons.
But you can just switch back to the old behaviour in the appearance settings?
Just disable the title bar behavior while keeping the "new ui"? I haven't seen that.
Shame it doesn't read the GTK settings on what buttons to show.
AFAICT it doesn't read much of anything under Linux. It has supported following the system light / dark setting for a while on Windows and MacOS, but it still doesn't do it on Linux. The kicker, though, is that a plugin is able to do it, so it's not impossible.