How do I completely quit a program or app on MacBook Pro?

Quitting an app is done by choosing the app name in the menu bar and going down to quit app.

Quit apps on Mac - Apple Support

Some apps have processes that run in the background and can be seen at  > System Settings > General > Login & Extensions.

If you have any other questions about quitting the app or how to uninstall it completely, let us know the name of the app.

Click the app's name in the Menu bar and then click 'Quit'.

Or, with the app on screen, press command-Q (⌘Q).

Quit apps on Mac - Apple Support