Receive, pause or stop notifications on Mac
Many apps on your Mac use notifications to let you know about events, updates or changes. Notifications appear briefly in the top-right corner of the desktop or stay there until you close them.
View notifications
On your Mac, move the pointer over a notification, then do any of the following:
Expand or collapse a stack of notifications: If an app’s notifications are grouped, multiple notifications are stacked. To expand the stack and see all the notifications, click anywhere in the top notification. To collapse the stack, click Show less.
Take action: Click the action. For example, click Snooze in a notification from the Calendar app, or click Reply in a notification from the Mail app.
If an action has an arrow
next to it, click the arrow for more options. For example, to reply to a call using the Messages app, click the arrow next to Decline, then choose Reply with Message.See more details: Click the notification to open the item in the app. If an arrow
is shown to the right of the app name, click the arrow to see details in the notification.Change an app’s notification settings: If an arrow
is shown to the right of the app name, click the arrow, click the More button 
, then choose an option:Deliver Quietly: Notifications are not shown in the upper-right corner of the screen or on the Lock screen (they are shown in Notification Centre), and a sound is not played when you receive notifications.
Deliver Prominently: Notifications are shown in the upper-right corner of the screen and on the Lock screen (and in Notification Centre), and a sound is played when you receive notifications.
Turn Off: Notifications are not received. To turn on notifications again for the app, choose Apple menu
Notification Preferences: Show the app’s notification settings in Notifications preferences.
Clear a single notification or all notifications in a stack: Click the Clear or Clear All button
.
Pause notifications
On your Mac, choose Apple menu
In Notifications preferences, select Do Not Disturb on the left, then set options.
When Do Not Disturb is on, the Do Not Disturb icon
is shown in the menu bar. You don’t see or hear notifications when they arrive; they’re collected in Notification Centre where you can view them later.
To quickly turn on Do Not Disturb, you can use Control Centre, press and hold the Option key while you click the date and time in the menu bar or press 
(if available in the row of function keys on the keyboard). See Use Do Not Disturb on your Mac.
Stop notifications
On your Mac, choose Apple menu
In Notifications preferences, select an app on the left, then deselect the Allow Notifications option for the app.
All other notification options for the app are dimmed. You don’t receive notifications for the app until you set the option to allow them.