LG One:Quick Share Owner's Manual page 25

- During the multi-screen share mode, pressing the button on the shared dongle for 2
seconds or longer will switch the LG device to full-screen mode and the corresponding
dongle's screen is shared.
• If you press the button on the Dongle (or the [Stop Sharing] button on the PC app
menu) while the screen is being shared, screen sharing is turned off.
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