Click on the Set button for the Target Filter setting.
In the small camera display that will popup there will be two yellow boxes. The largest box is to set up the maximum side of a person’s face to detect. Think of this box and the area you want faces to be detected in. The second smaller box is for setting the setting for the smallest face that the recorder will detect and save snapshots for. This box should normally stay the default size as normally anything smaller that it does not have enough detail.