TANDBERG 1000 MXP - Manual (Page 114)

D1372202_T1000_MXP_User_Manual
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Press the Layout button once more to change to 1+2 layout. The far end
image will be displayed as the main video, with the near end, usually the
user of the system, as a smaller image in the upper right corner. If Duo
Stream is used, the Dual Stream image is displayed as the main image and
the far end and near end as smaller images to the right, see figure below for
an example.
Press the Layout button again to get the 1+3 layout.
The next time the Layout button is pressed, the normal full screen view of
the far end is displayed. Pressing and holding Layout for 1 second will
always bring you back to full screen.
Example of Picture in Picture.
Example of 1+1 Side-by-Side view (wide screen).
Example of 1+2 Picture outside Picture (wide screen).