Dell U4320Q Display Manager Users Guide - Page 7

When multiple Dell monitors are connected, select Enable display matrix, control to apply brightness

Page 7 highlights

NOTE: When multiple Dell monitors are connected, select "Enable display matrix control" to apply brightness, contrast and color presets controls to all monitors. Using the Quick Settings Dialog │ 7

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Using the Quick Settings Dialog
7
NOTE:
When multiple Dell monitors are connected, select “Enable display matrix
control” to apply brightness, contrast and color presets controls to all monitors°