ArcGIS Pro 2.3 API Reference Guide
GetLockedAspectRatio Method
Example 

ArcGIS.Desktop.Layouts Namespace > Element Class : GetLockedAspectRatio Method
Gets the locked aspect ratio value of the element. If This method must be called on the MCT. Use QueuedTask.Run.
Syntax
Public Function GetLockedAspectRatio() As Boolean
public bool GetLockedAspectRatio()

Return Value

Returns a Boolean
Exceptions
ExceptionDescription
This method must be called within the lambda passed to QueuedTask.Run.
Remarks
Returns true if an element has maintain aspect ratio enabled.
Example
//Modify an element's aspect ratio. 

//Perform on the worker thread
await QueuedTask.Run(() =>
{
  bool elmLocked = element.GetLockedAspectRatio();
  elmLocked = false;  //Turn off the locked state.

  element.SetLockedAspectRatio(elmLocked); //You don't have to get to set; a shortcut would be: element.SetLockedAspectRatio(false);
});
Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 7

See Also

Reference

Element Class
Element Members