Dell S2721QSA User Manual page 60

When you change the default setting of power saving features for the first time,
such as Smart HDR or Fast Wakeup, the following message appears:
NOTE: If you select Yes for either of the features mentioned above, the
message will not appear next time when you intend to change the
settings of these features. When you perform a factory reset, the
message will appear again.
When Smart HDR is activated and you try to change the preset mode, the
following message appears:
You will see the following message before the Lock function is activated:
NOTE: The message may be slightly different according to the selected
settings.
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60 Operating the monitor