Control access to information in apps on iPad
You control whether third-party apps have access to information in Contacts, Photos, Calendar, and other apps.
Review or change access to information in apps
The first time an app wants to use information from another app, you receive a request with an explanation. For example, a messaging app may request access to your contacts to find friends who are using the same app. After you grant or deny access, you can change access later.
Go to Settings
> Privacy.
Tap a category of information, such as Calendars, Reminders, or Motion & Fitness.
The list shows the apps that requested access. You can turn access on or off for any app on the list.
Note: To understand how a third-party app uses the data it’s requesting, review its terms and privacy policy. See the Apple Support article About privacy and Location Services.