If you want force an app or program to quit on your Mac, you can use a similar keyboard shortcut to PC's Control+Alt+Delete.

6. If you delete the key in which you've found the DisplayName key with the value equal to your program's name, then your program won't appear on the Add/Remove programs list.

It's easy to uninstall Microsoft OneNote from your Windows or Mac computer if you no longer want to use the program.