The purpose of this extension is simply to customize the Ubuntu Dock. It does not provide any extra functionality; when opening the settings, it will simply show the settings offered by Ubuntu Dock itself. If Ubuntu Dock is not installed, no settings dialog will be available. Please note that Ubuntu Dock is not available on extensions.gnome.org as an extension. I will do my best to try and keep this up to date with new versions of Ubuntu Dock as they become available.

Extension Homepage https://github.com/higgslagrangian/dock-settings/