ArcGIS Pro 2.7 API Reference Guide
SelectAllElements Method (ReportView)
Example 

ArcGIS.Desktop.Reports Namespace > ReportView Class : SelectAllElements Method
Select all report elements in a report view.
Syntax
public void SelectAllElements()
Public Sub SelectAllElements() 
Example
var pageFooterSection = report.Elements.Where(elm => elm is ReportPageFooter).FirstOrDefault() as ReportPageFooter;

pageFooterSection.SelectAllElements();
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

ReportView Class
ReportView Members