Canon VB-C300 Administrator's Manual page 182

Arrange and Save Layouts
The Viewing Area with a Small Grid
The Viewing Area with a Medium Grid
Note
182
Although you can add more, the number of Video Windows you
can display simultaneously will depend on your video card, the
speed of your computer, the maximum frame rate (➝P. 169)
configured with Viewer setting, the video size and video quality
coming from the Camera Server and the size of each Video
Window displayed. A maximum of 16 cameras is recommended
in the Layout Area. If the number of video windows displaying
MPEG-4 live video exceeds 20, a warning message will appear.