40000 appears to be the limit that the product can currently support for export without causing a performance impact. Going higher than 40000 could negatively affect the EDR cluster
The configuration change applies to Binary Search, Process Search, and Triage Alerts results.
The number of rows exported for a large search depends on (1) the server's specifications of CPU and RAM to process the new large export, and (2) your local system's resources available to your browser.
For Hosted EDR please open a case to request a config change up to 'SearchExportCount=40000'