Canon VB-C300 Administrator's Manual page 190

Basic Video Window Functions
Note
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Add more Video Windows
Click and drag other camera thumbnails onto the Viewing Area to create Video Windows
for monitoring if necessary. Your Viewing Screen could look like this.
190
When Video Windows that are other than a standard resolution
(160x120, 320x240, 640x480) are displayed, the load on the
computer CPU will be high and Viewer operations may take
longer.