Use the following steps to connect to an external monitor.

1. Connect the external monitor to the appropriate connector on the PC, such as an HDMI connector. Search for the manual (for example, T480s manual) on the web site to review the product user guide manual (How To Find And View Manuals For Lenovo Products). The user guide lists the location and types of connectors that the PC supports.
2. Use F7 on the keyboard (or Fn and F7) to open the Project dialog. Windows logo key + P can also be used to open the Project dialog. Choose Duplicate, Extend, or Second screen only to use the external monitor.
   • PC Screen Only - do not use the external monitor.
   • Duplicate - show the same screen on both devices.
   • Extend - create extended desktop space on the external monitor.
   • Second screen only - display the screen only on the external device.
     

Windows should select the correct display resolution automatically when connecting to an external monitor. If there are issues, try adjusting the display settings.

See the following link for more information: View display settings in Windows 10, 11

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