Why doesn't Apple xr display a prompt message after exiting the application?

There may be a problem with the background application brush.

Open iPhone Settings-Notifications, find the application you need to optimize notifications in the list, and then click. Click Banner Style to change the default Temporary to Continuous. In this way, the corresponding application notification will continue to be displayed until you view it.

In this interface, you can also set whether to allow notifications, whether to allow screen locking notifications, the style of notifications, whether to display details and so on. For some unimportant applications, the notification can be turned off directly to save power and prolong battery life.