FORD 2013 Flex v.2 - Manual (Page 226)

Rear Camera Delay
When shifting the transmission out of R (Reverse) and into any gear
other than P (Park), the camera image remains in the display until the
vehicle speed reaches 6 mph (10 km/h). This occurs when the rear
camera delay feature is on, or until a radio button is selected.
Selectable settings for this feature are ON and OFF. The default setting
for the rear camera delay is OFF.
226 Parking Aids
2013 Flex (471)
Owners Guide gf, 2nd Printing
USA (fus)