VMC4050P PRO 4 camera does not trigger video recording within activity zone

[JayneH]

I have selected activity zone to include the top end of my drive, to detect any vehicle person entering my property.  The Pro 4 Camera does not trigger video recording or alert notification when there is motion at furthest points 6 - 7 metres away. It only triggers video and alert from the people leaving the property,  which is to the camera closest end of activity zone @ 2 - 3 metres

[jguerdat]

What is the motion sensitivity setting? A screenshot of the camera view may be useful as well as a description of how motion occurs (motion is best detected with motion is across the FOV, not at the camera).