Official comment
Hey Jon,
1. Did you properly install the drivers? Most people miss this step and have to then uninstall the drivers (from the driver installation package), reboot, reinstall, allow the drivers through security, then it will work.
2. Press the SHORTCUT button beside the display, then press the DECK 1/3 or DECK 2/4 button to switch. The double-press shift function will be included in a future firmware update.