Ubuntu 17.10, open last used window from group, when clicked in Dock

It seems that the behavior of the click action can be changed with:

gsettings set org.gnome.shell.extensions.dash-to-dock click-action 'cycle-windows'

cycle-windows is the closest behavior to unity.

You can list other values with:

gsettings range org.gnome.shell.extensions.dash-to-dock click-action