I have a computer with a dual monitor setup, configured thanks to the nvidia-settings utility that comes with the proprietary NVIDIA drivers.

Everything seems to work fine, except that I am unable to move windows between the two desktops. I can move the mouse between the desktops, but I am restricted to moving the window between the virtual desktops associated with that particular monitor's desktop switcher (virtual desktops).

How can I configure XFCE and/or xorg such that I will be able to move windows between the monitors? It is really cumbersome to use two monitors without being able to move the windows across the monitors so it would be great to find a solution for this.

Thanks in advance.