It is a setting which can be found in the owners handbook/ manual,  I don't know off the top of my head but I could find out for you tomorrow as I would have to look it up. Hope this would help.

 

REPROGRAMMING THE UNLOCKING FUNCTION



You can program the unlocking function so that only the driver door unlocks.

 Press and hold the unlock and lock buttons on the remote control simultaneously for at least four seconds with the ignition off. The direction indicators flash twice to confirm the change.

To return to the original unlocking function, repeat the process.

If you program the unlocking function so that only the driver door unlocks, the following occurs:

If you unlock the driver door first, all other doors remain locked.You can unlock all of the other doors from inside your vehicle using the power door lock control on the driver door.Doors can be individually unlocked by pulling the interior door handles on those doors.

If you press the unlocking button on the remote control once, only the driver door unlocks. Press the unlocking button on the remote control twice within three seconds to unlock all doors.

If you unlock any other door first, all other doors and the liftgate unlock.

You can also change between the unlocking modes in the information display.

Using the information display controls on the steering wheel, select Settings.

Select Vehicle Settings.

Select Locks.

Select Remote Unlock.

Select All Doors or Driver's Door.

Ford Owners Handbook:

 

Cheers folks. 
 

I’ll give this a go.