Ford Expedition 2018 Owner's Manual page 186

Unique Driving Characteristics
If your vehicle is in an engine off
Auto-Start-Stop, shifting from drive (D) to
reverse (R) will not cause a restart if you
do not press the brake pedal. The message
Auto-Start-Stop Press Brake to Start
Engine appears. You must press the brake
pedal within 60 seconds or the system
requires you to shift into park (P) and
manually restart your vehicle.
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Expedition (TB8) Canada/United States of America, enUSA, Edition date: 201708, Third-Printing-