AVer M11-8MV Manuel D'instructions page 12

Presentation Mode (Live)
[Note] Before using annotation feature or PIP/PBP function of presentation
mode, set the camera to Power Supply Only mode first. Go to OSD menu >
SETTING > USB to PC > Power Supply Only.
Annotation
In single image live (preview) mode, user can use the annotation feature to
overlay straight line or freeform line on the captured image with the USB mouse
connected to the USB port of M11-8MV.
1. Connect the mouse to USB port of M11-8MV.
2. Go to OSD menu > PRESENTATION > Annotation.
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