Notifications help you keep track of what’s new—they let you know if you missed a call, if the date of an event moved, and more. You can customize your notifications so you see only what’s important to you.
Note: While you’re using an app, you might be asked how you want to receive notifications from it—immediately, not at all, or in a Change notification settings to learn about the settings you can change.
Clear all your notifications in Notification Center: , then, depending on your model, tap one of the following.
Face ID & Passcode
Touch ID & Passcode
Passcode
Enter your passcode.
Turn on Notification Center (below Allow Access When Locked).
If you have an Change notification settings on iPad