Configure GNOME/GTK Application Style

[luca.pedrielli]

after updating my Debian testing, I no longer find the ability to change 
Gnome / gtk application style in systemsettings.

kde-config-gtk-style: amd64 4: 5.19.5-3 is installed.
i can manually edit .config / gtk-3.0 / settings.ini and it works.

Am I the only one? I'm blind? ;)

Thanks, Luca.