LG One:Quick Share Owner's Manual page 24

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• Pressing the button on the dongle for 2 seconds or longer while the screen is shared
will switch the LG device to the multi-screen share mode. The multi-screen share mode
may not be supported depending on the type of LG device.
- In the multi-screen share mode, pressing the dongle button on a non-shared PC will
share 2 screens to the LG device. Pressing the dongle button on another PC will allow
you to share the screens of up to 4 PCs to the LG device depending on the type of LG
device. The maximum number of screen shares may be limited depending on the type
of LG device.