Lenovo L27e-40 User Manual page 7

Display Control
Different functions can be used through the key controls on the panel frame.
For information on how to use these key controls, see "Adjusting the Display Image" on pages 2-3.
Kensington anti-theft lock
Your display is equipped with a Kensington anti-theft lock, which is located on the back of the display.
Chapter 1. New Member Guide 1-3