Stefani posing for a solitary group shot. (Patreon)

In school, sport, or any picture of large groups, you ask the shorter people to stay in front and kneel down.
I suspect Stefani was never asked to do that as she is over 180 cm tall, she would probably be one of the last in the back, hidden by everybody else.
Fortunately in this case there is no other people to hide behind and we can see all of her charms even in a kneeling position.