Extents

The initial extents refer to the spatial reference and the boundaries of the map when it first opens in a portal section or form tab.

If the well-known ID (WKID) is not appropriate for the basemaps and layers, your map section is blank and does not contain a map. Two examples of WKID values are 4326 and 102100.

For more information, see the WKID values for the geographic coordinate system and the projected coordinate system.