To remove an application from a Mac's "Notification Center", click on the Apple icon → Click on "System Preferences" → Click on "Notifications" → Click on an application → Remove the check mark from the "Show in Notification Center ".
Steps
Step 1. Click on the Apple icon
It depicts the Apple logo and is located in the upper left corner of the menu bar.
Step 2. Click on System Preferences
Step 3. Click on the "Notifications" icon
It looks like a gray box with a red dot in one corner.
Step 4. Click on an application on the left side of the window
Step 5. Click on the "Show in Notification Center" box to remove the check mark
It is located on the right side of the "Notifications" window.
Step 6. Click on the red "x" button
The application will no longer appear in the Notification Center.