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The History and Suggestions tabs in the Spotlight Search area show the Content, People, and Places you have recently visited (History) or frequently visited (Suggestions) in your community. For a more detailed listing of items in your history, click Show all my recently viewed content. From there, you can sort your items by date or use a keyword search to filter them.
For more details on how search works, you might find this document helpful How does search work?
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