Lenovo ThinkCentre Tiny-In-One 24 Gen 5 23.8" Multi-Touch Monitor with Webcam - Manual (Page 11)

Monitor controls
The keypad controls on the back cover are accesses to various functions.
For information on how to utilize these keypad controls, please see “Adjusting your monitor
image”on page 2-7 .
Chapter 1.Getting started 1-6