This feature is used to turn off the light powering the screen. The computer of the display keeps working, and so does the audio. Only the screen content is hidden.
Summary of video
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Hide screen: Press the button on the front of the display, under the CTOUCH logo, to access the Quick Menu. From here press the icon under the brightness slider (this is called Backlight Mute).
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Speed up: Backlight mute happens after a short countdown. To skip the countdown, tap on the running rabbit.
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Show screen: Tap anywhere on the front of the display with two fingers and the image will return.
You can tell if the screen is backlight muted because the power button is glowing with a white light instead of a red light (off)