The Data Management Menu of the Admin Panel will show Admin users potential duplicate records in the User and Organization record type. Each record type has its own tab within this menu to see the potential duplicate users in a different list than the potential duplicate organizations.
Despite there being a large "Merge" button at the top of of both of these tabs, duplicate records cannot actually be merged from this screen. If you want to merge some of these duplicate records, please see the Merging Duplicate Contacts/Organizations section for information on how to do so.
The People tab will show you potential duplicate User records for your knowledge. Please see the screenshot below for highlighted items from the People tab and beneath the screenshot for descriptions of said items.
The Organizations Tab is almost exactly the same as the People Tab, with the exception that it shows potential duplicate Organization records rather than potential duplicate user records. Please see the screenshot below for highlighted items and beneath the screenshot for descriptions of said items.