ArcGIS Pro 2.6 API Reference Guide
ClearElementSelection Method
Example 

ArcGIS.Desktop.Layouts Namespace > LayoutView Class : ClearElementSelection Method
Clear all layout elements in the layout view.
Syntax
public void ClearElementSelection()
Public Sub ClearElementSelection() 
Example
//Clear the layout's element selection.

layoutView.ClearElementSelection();
Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 7

See Also

Reference

LayoutView Class
LayoutView Members