How does iphone completely turn off notifications?

As shown in the figure, click to enter the system settings.

2/6

Entry notification settings

3/6

Find and click the application (software) that needs to close the notification.

4/6

Enter the notification management interface of the software, you can disable notification with one key, or choose the notification form according to your own needs.

5/6

As shown in the figure, I choose to disable all notifications of this software.

6/6

If you think the mobile phone is too noisy, you can disable the notification authority of most software, and only keep the notification of necessary software such as telephone and SMS.