Contacts privacy settings is part of the Settings application which allows you to customize your contacts access permissions for apps and users. Recent Windows 10 builds can be configured to allow or deny access to the contact details for your installed apps and the operating system itself. Only if allowed, the OS and installed apps will be able to use your contacts and their data.
The recently released Windows 10 build 10061 features an updated People app. Out-of-the-box, this application does not work and crashes, however, with by editing a file, it is possible to get this app working. Here is how it can be done.