This article explains why the 'Auto Adjust' feature is grayed out on an Elo monitor

The Auto Adjust feature is only available when the monitor is connected through a VGA video connection. Auto adjust will be grayed out on all other video connections, such as: HDMI, DisplayPort, USB-C, DVI

For more information about using the Auto Adjust feature, please see our article, How to Auto Adjust Elo Display's Image