Automatic indexing will work even if the list held more than 20,000 items.

[hrfmjp]

In my tenant results are as follows. The index was created automatically even when the list held more than 20,000 items.

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Document Details

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• ID: e7c49951-8871-c489-e4f3-81d845ebbce3
• Version Independent ID: c84959ec-3662-6963-00dc-5b3a0d9873c0
• Content: Living Large with Large Lists and Large Libraries
• Content Source: Community/large-lists-large-libraries-in-SharePoint.md
• Service: sharepoint-online
• GitHub Login: @PatD
• Microsoft Alias: daisyfeller