This is an archive related to a previous version of Esri Maps for SharePoint. If you need the current version go to http://doc.arcgis.com/en/maps-for-sharepoint/.
You might want your map to automatically zoom to display the combined area of specific layers each time it's loaded in a SharePoint site. You can turn on this behavior using the Zoom on load setting on each of the layers you want to include in the combined zoom area.
Each time the SharePoint site opens, the map will automatically zoom to show the combined area of all the layers for which the Zoom on load setting was turned on.