How to Set Your MacBook’s Notifications Preferences
Each application that can display notifications on your MacBook appears in the list at the left of the pane. The Do Not Disturb entry at the top of the list allows you to set Do Not Disturb mode automatically at certain times, or allow FaceTime calls from specific contacts.
Do Not Disturb mode disables banners and alerts and mutes the sounds normally played by the Notification Center to get your attention. You can toggle Do Not Disturb mode on and off manually at the bottom of the Notification Center.
Click an application in the list at the left, and then choose from these settings at the right:
Alert Style: These three buttons specify which type of alert should appear under the Notification Center icon in the menu bar. You do not need to display the Notification Center to see alerts, which appear on your Desktop.
Choose None to disable alerts for this application. Choose Banners to display alert messages that automatically disappear after a delay. Choose Alerts to display alert messages that remain onscreen until you click the confirmation button in the Alert dialog.
Show in Notification Center: To display notification messages from this application in the Notification Center, select this check box. You can also specify how many recent messages from this application are displayed.
Badge App Icon: This check box toggles on and off the display of this application’s icon in alert boxes and in the Notification Center. It also activates the numeric display of pending items on the icon itself (for example, unread mail and messages).
Play Sound for Notifications: To play a sound when alerts appear, enable this check box.