You can see public and private contacts and organizations on the contacts list. Hidden contacts and organizations are only displayed on the contacts list for people who have access to them. 

If you are the account owner or Administrator for your firm and you require information about hidden contacts and organizations in your account, please contact support through Help & feedback in your main menu.

Further reading
Granting access to a private or hidden work item
Granting access to a private or hidden contact

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