Dell U3821DW 37.5" 21:9 Curved IPS Monitor (Silver) - Manual (Page 57)

Operating the monitor
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Others Select this option to adjust the OSD settings, such as
DDC/CI , LCD Conditioning , and so on.
Display Info Displays the monitor's current settings.
DDC/CI DDC/CI (Display Data Channel/Command Interface)
allows you to adjust the monitor settings using
software on your computer. You can disable this
feature by selecting
Off .
Enable this feature for best user experience and
optimum performance of your monitor.