Lenovo ThinkVision M14t User Manual page 14

3. L-shape dongle usage.
4. Power on the monitor.
5. To install the monitor driver, you must download it from Lenovo website,
1-7 M14t Flat Panel Monitor User's Guide
The L-shape dongle can be connected to the adapter or USB-C port to have a better
cable management.
Note: Suggest to use when you rotating the monitor to a different angle, do not use
when you need to press the direct access controls key.
(https://pcsupport.lenovo.com/solutions/M14t) and follow the instructions on page 3-5.