More details on bounding box properties

Together, a MapControl's MaxBounds directional properties construct a bounding box to restrict the viewable area within a map that can be shown by user's screen viewport, regardless of the map zoom level.

Rather than restrict the viewable area of a map to the area strictly within the bounding box, the MapApp enables users to extend the screen viewport to its center point beyond the borders of the bounding box.

When a zoom level is set to a very low percentage to show the maximum map area, a bounding box does not significantly reduce the viewable map area because moving the center of the screen viewport to the border of a bounding box will likely show the majority of the map.

Specify zoom level percentage ranges of the layers of your map to minimize the amount of zooming or panning required to see the entire area within the bounding box. Set the zoom percentage layer ranges more narrowly to be able to show assets at different map layers with reduced zooming and panning.