ArcGIS Pro 2.6 API Reference Guide
ZoomTo Method (LayoutView)
Example 

ArcGIS.Desktop.Layouts Namespace > LayoutView Class : ZoomTo Method
The geometry defining the extent in which to pan.
The amount of time to navigate the view to the new camera position. If null it uses the default navigation duration.
Zoom the layout view to the extent defined by a geometry. This method must be called on the MCT. Use QueuedTask.Run.
Syntax
Public Function ZoomTo( _
   ByVal geometry As Geometry, _
   Optional ByVal duration As Nullable(Of TimeSpan) _
) As Boolean

Parameters

geometry
The geometry defining the extent in which to pan.
duration
The amount of time to navigate the view to the new camera position. If null it uses the default navigation duration.

Return Value

Returns true if the navigation is completed, false if it was interrupted by another view navigation.
Exceptions
ExceptionDescription
This method must be called within the lambda passed to QueuedTask.Run.
Example
//Set the page extent for a layout view.

//Process on worker thread
await QueuedTask.Run(() =>
{ 
  var lytExt = layoutView.Extent;
  layoutView.ZoomTo(lytExt);
});
Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 7

See Also

Reference

LayoutView Class
LayoutView Members