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It should be at url /civicrm/documents/search. It looks like you need administer CiviCRM permission to use it. If for some reason it isn't finding it try rebuilding the menu with /civicrm/menu/rebuild?reset=1 I'm assuming you mean this extension: https://github.com/CiviCooP/org.civicoop.documents/blob/master/documents.php#L95

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