In North America it is common to have about 75% of the staff focus on filling drive thru orders while the rest handle walk ins. I’ll frequently see 4-5 employees working different stations to make the drive thru flow while 1 employee has to handle all the work (except maybe the grill) for the walk ins.
In nearly every aspect of life in North America, you are treated as a second class citezen if you walk instead of drive.