It depends on what and how you use the system. If you use MS Outlook, simply open the program and click on Contacts.
If you have the People App, you should be able to type: "People" in the search box, click on the People app and go from there.
https://support.microsoft.com/en-us/help/10614/windows-10-where-are-my-contacts
Hope this helps.
Grif
Where should contacts appear in Windows 10?

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