As mentioned, an overview is not available in the standard. A system administrator can view it per user with the workaround provided by Waed. You can also use the table browser to view all delegation records at once or build your own inquiry form or report. The details are stored in the table WorkflowWorkItemDelegationParameters.
You can view the table browser for this table by altering the URL parameters like below:
No, it's not in standard, consider it for customization.
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