To remove an app from the Notification Center on your Mac, click on the Apple icon → Click "System Preferences" → Click "Notifications" → Click on an app → Uncheck the box next to "Show in Notification Center."
Steps
Click on the Apple icon.
It’s the Apple logo in the top left corner of the menu bar.
Click System Preferences.
Click the “Notifications” icon.
It looks like a grey square with a red dot in one corner.
Click on an app from the left side of the window.
Click on the “Show in Notification Center” check box to uncheck it.
It’s on the right side of the Notifications window.
Click the red “x” button.
The app will no longer appear in your Notification Center.