gnome-tweak-tool is missing the window option

One ubuntu setup looks the following way in gnome-tweak-tool:

enter image description here

I'm customizing a new machine, but the "Window" option is no longer available:

enter image description here

The first image is from Ubuntu 14.04, and second is from 16.04.1.

How can I bring the window option back? Am I missing some kind of package?


Solution 1:

The Window theme setting was removed because it's not needed in GNOME any more. The window theme is now controlled by the GTK+ theme.