LOL
He means, from a farther perspective, they will APPEAR smaller.
Two ways.
Use "Camera - Set camera field" trigger to increase the camera distance
Or
Create a new camera somewhere on the map, with a greater distance, and use the trigger "Camera - Apply camera object"
The first way is best if you don't intend to apply the camera at an exact point on the map.
PROBLEM
No matter which way you do it, if they roll the mouse wheel and adjust the camera view, it resets. So you need to periodically set the distance again.