> When I close all the windows of an app why on earth does the app stay open? Apple agrees and indeed many of its first-party apps work like that. Close the la

> When I close all the windows of an app why on earth does the app stay open? Apple agrees and indeed many of its first-party apps work like that. Close the last window in Numbers, Keynote, Preview, and the app will disappear from the Dock. This is opt-in by the app for compatibility reasons, and Powerpoint has not opted in, perhaps because there's no obvious benefit to the app for doing so.