Dell P2421 User Manual page 49

Personalize
Shortcut Key 1 Allows you to choose a feature from Preset Modes,
Brightness/Contrast, Auto Adjust, Input Source,
Shortcut Key 2
Aspect Ratio, or Rotation and set it as a shortcut
key.
Power Button Allows you to set the power LED indicator on or off
LED to save energy.
USB Allows you to enable or disable USB function during
monitor standby mode.
NOTE: USB ON/OFF under standby mode is only
available when the USB upstream cable is
unplugged. This option will be grayed out when the
USB upstream cable plugs in.
Reset Resets all settings under the Personalize menu to
Personalization the factory preset values.
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Operating the monitor 49