How to Clear All Notifications at Once on iPhone
Step 1. Open the Notifications on your iPhone by sliding your finger down from the top edge of the screen.
Step 2. You will see all the notifications that you have received on your iPhone with an “X” at the top of the notifications.
Step 3. To delete individual notifications, swipe left on the notification that you want to delete and tap on clear.
Step 4. To delete All notifications at once, press on the “X” button until you see the “Clear All Notifications” prompt.
Step 5. Next, tap on Clear All Notifications to get rid of all notifications on your iPhone in one go.