ViewSonic ViewBoard IN01 Series User Manual page 96

Switch the Audio Source
The audio of the last sharing device will be output by default from the display when
in Multiple Screen mode. Selecting any one of the split windows on the display will
change the audio output source.
NOTE: For Android phones with Android 10.0 or later, audio can be played
through the display while mirroring only if the other applications allow
their audio to be recorded. For Android 9.0 or before, the audio cannot
be casted as Google doesn't share the API needed for audio casting. The
audio of those Android phones while screen sharing will only be output
from the phone.
Full Screen or Multiple Screens
Select the Full Screen icon at the bottom right of the display when in Multiple
Screen mode to change the aspect ratio to full screen. Select the icon again to exit
Full Screen mode and go back to Multiple Screen mode.
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