اس کنٹرول میں ترمیم کرنے سے یہ صفحہ آٹومیٹک طریقے سے اپڈیٹ ہو جائے گا
Turn off notifications in Messages on Mac
If you don’t want to get notifications each time there’s a new message in a conversation, you can turn on Do Not Disturb.
In the Messages app
on your Mac, select a conversation, then click Details in the top-right corner.Select Do Not Disturb.
To get message notifications again, deselect Do Not Disturb.
If you have a trackpad or a Magic Mouse, you can also swipe right with two fingers on the conversation in the sidebar, then click the Do Not Disturb button 
.
To turn off notifications for all messages, change your Notification preferences. You can also change the type of notifications you receive for messages (for example, playing a sound or showing a badge on the Messages icon in the Dock). See Receive, pause or stop notifications on Mac.