Dell UltraSharp 34 User Manual page 58

You will see the following message before the DDC/CI function is disabled:
When you adjust the Brightness level for the first time, the following message
appears:
NOTE: If Yes is selected, the message will not appear next time when
you intend to change the Brightness setting.
When you change the default setting of power saving features for the first time,
such as Uniformity Compensation, USB-C Charging
Charging, or Fast Wakeup, the following message appears:
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58 Operating the monitor
90W, Other USB