ArcGIS Pro 2.8 API Reference Guide
ZoomToFullExtentAsync Method
Example 

ArcGIS.Desktop.Mapping Namespace > MapView Class : ZoomToFullExtentAsync Method
The amount of time to navigate the view to the new camera position. If null it uses the default navigation duration.
Zoom the view to the full extent of the map or scene.
Syntax
public Task<bool> ZoomToFullExtentAsync( 
   Nullable<TimeSpan> duration
)
Public Function ZoomToFullExtentAsync( _
   Optional ByVal duration As Nullable(Of TimeSpan) _
) As Task(Of Boolean)

Parameters

duration
The amount of time to navigate the view to the new camera position. If null it uses the default navigation duration.

Return Value

True if the navigation is completed, false if it was interrupted by another view navigation.
Example
Zoom to the map's full extent.
public Task<bool> ZoomToFullExtentAsync()
{
  //Get the active map view.
  var mapView = MapView.Active;
  if (mapView == null)
    return Task.FromResult(false);

  //Zoom to the map's full extent
  return mapView.ZoomToFullExtentAsync(TimeSpan.FromSeconds(2));
}
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

MapView Class
MapView Members