Hi Farukh,
Undock a Portable Computer
https://technet.microsoft.com/en-us/library/cc754084.aspx
According to the additional considerations:
Undock appears on the Shutdown Options menu only if the computer is Advanced Configuration and Power Interface (ACPI)-enabled and recognized as a portable computer in a docking station. If Undock does not appear on the Shutdown Options menu, your computer
is not ACPI-enabled, or might not support undocking.
Some computers have an eject button on the docking station. Pressing the eject button instead of following this procedure also undocks the laptop. For more information, see the documentation provided with your docking station.
You may need to contact the Lenovo to confirm the machine supports undocking .
Best regards
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Edited by
MeipoXu
5 hours 43 minutes ago