How to turn on Notification History on Android Phone

Step 1: Go to Settings and tap Notifications.
   


Step 2: From the notifications toggle, tap on Advanced settings.



Step 3: Then navigate to Notification history.



Step 4: On the first visit to this page, there should be nothing but a toggle on the right side of the page.
Tap the toggle to enable Notification history.




Credit : https://www.airdroid.com/parent-control/android-notification-history/#:~:text=To%20access%20notifications%2C%20go%20to,in%20the%20last%2024%20hours.