Here’s how you can turn off login item notifications on a Mac:
Click on the Apple icon in the top left corner of your screen and select “System Preferences.”
Click on “Users & Groups.”
Click on your username in the left-hand column.
Click on the “Login Items” tab.
Uncheck the box next to “Show” for any login item that you don’t want to see notifications for.
Close the Users & Groups window.
That’s it! You should no longer see notifications for the login items that you’ve unchecked.