Apple’s banner notification system leaves a lot to be desired, especially since modern banners are so huge when they appear that they cover all kinds of important parts of your apps, such as navigation bar, which is often an essential part of navigating your apps.
Because banner notifications are excessively large, a new free jailbreak tweak called Eyeplugs by the author The Holy Constituency of the Summer Triangle can help prevent them from appearing whenever you’re inside of designated apps, but once you close the app(s), you’ll get a summary of all your missed notifications.