How to enable De-duplication in eDiscovery search results

In order to enable De-duplication in eDiscovery search results in reference to the article below,
De-duplication in eDiscovery search results - Microsoft 365 Compliance | Microsoft Docs

Please refer to the instructions below,

1. Point 5 of the "Export search results" section of the article below,
Export and download content from a Core eDiscovery case - Microsoft 365 Compliance | Microsoft Docs

Note: When you export search results, you have the option to enable de-duplication so that only one copy of an email message is exported even though multiple instances of the same message might have been found in the mailboxes that were searched. For more information about de-duplication and how duplicate items are identified, see De-duplication in eDiscovery search results.

2. Point 5 of the "Step 1: Prepare search results for export" section of the article below,

Export Content search results - Microsoft 365 Compliance | Microsoft Docs