LG X screen Instruction Manual page 153

Turning on and off Second screen feature
You can turn on and off the Second screen feature and select what to display.
Tap Settings Display Second screen.
Show when main screen on: Select content to show on the second screen.
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Provide the useful function for multi tasking.
Show when main screen off: Select content to show on the second screen when
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the main screen is off. Always show the useful information and provide quick launch
of frequently used functions.
More Show time while content is shown: Show the time and phone status
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while media content such as images and videos is shown.
Custom-designed Features
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