iOS, iPadOS, and macOS all let you specify whether any given app should show no notifications, temporary banners, or persistent alerts: look in Settings > Notifications and System Settings > Notifications. Temporary banners appear briefly and then automatically disappear, which is appropriate for notifications requiring no acknowledgment. But what if you see a temporary banner only as it’s disappearing and can’t read it in time? You can find a historical list of notifications in Notification Center. To open it from the Lock Screen on an iPhone or iPad, swipe up from the middle of the screen. From any other screen, swipe down from the center of the top of the screen. On the Mac, click the date and time in the upper right corner. If your Mac has a trackpad, you can also swipe with two fingers from the right edge.