Press Super. You can browse the windows by TAB. I am thinking how to you can close the window without mouse or touchpad. Unsuccessful attempts
- alt+fn+f4 (Tyler's proposal)
The feature does not exist as default in the system based on C.W.'s comment.
To have a terminal command to make the change would be great in the system settings.
You can open and visualise the Gonme settings by
gnome-control-center in Terminal, where I cannot find Shortcuts and Windows, see Fig. 1-2.
Fig. 1 Only two menu settings in Windows, not corresponding the feature wanted, Fig. 2 No Shortcuts menu there
Tested on both X11 and Wayland 1.12 so there is no such a feature by default.
OS: Debian 9.1
Window manager: Gnome 3.22 on X11 and Wayland 1.12