If you enable this setting, the Undock PC button is removed from the simple Start Menu, and your PC cannot be undocked. If you disable this setting or do not configure it, the Undock PC button remains on the simple Start menu, and your PC can be undocked. Fix: (1) GPO: User Configuration\Administrative Templates\Start Menu and Taskbar!Remove the Undock PC button from the Start Menu (2) REG: HKEY_USERS\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer!NoStartMenuEjectPC