NCS Cirrus LT User Manual page 76

Option 3: Turn Off Native LCD; Use Display 1 of Docking
Station, and Display 2 of the Mini DP Port or the Docking
Station
This option allows you to close the notebook lid and use Display 2, or have one
display plugged into the docking station and a second mini DP Port for another
screen for an extended desktop.
Option 4: Use Display 1 on Docking Station Only
Choose this option if you wish to use Display 1 on the docking station only.
76 Cirrus LT User Manual v2.3 - Chapter 4