Polycom DOC2560C - Manual (Page 160)

Chapter 3-Basic Operation
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The Personal Layout keypad options menu is displayed on the video
screen.
2 On the endpoint’s remote keypad, press the number corresponding
to the number of video squares you wish to select.
For example, if you want a four-square video layout, press
.
The video window layout of your screen changes to the first four-
window layout as follows:
Repeated presses of the key, within eight seconds, cycles through
the following series of four-square layout options:
In any multi-square layout, pressing forces the current speaker
to the top left window.
In full view, pressing
forces the next participant to full view.
In any video layout, pressing reverts to the conference layout.