The user controls are a power button and two brightness controls.
The power button is preset to turn on both the display and the computer at the same time (or put the system in sleep mode).
You can change the power button setting so that pressing the monitor's power button affects the monitor only.
Monitor Power Key AfTects
O Monitor Power ® System Power
Power Button Setting
Note: With version 1.8.1 (and later) of the Apple Displays Software, the Monitors & Sound control panel became two separate control panels: "Monitors" and "Sound."
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