Vivotek NR9682-v2 64-Channel NVR (No HDD) - Manual (Page 121)

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User's Manual - 121
When the camera is in place, drag the FOV indicators on the edge to change the shooting angle
and the coverage range.
Drag the FOV to change the shooting direction to match the actual installation.
Click on the camera icon. You can also change the color of camera icon and the FOV type.
Fisheye cameras, when ceiling mounted, have a round shape coverage.