If you use the new version of Acrobat Pro DC, then perhaps you are a bit annoyed with the behaviour, when you close the last document. Because the a recent file window show up.
You then need to close this as well.
But Keyboard Maestro to the rescue.
You need to use the shortcut cmd+W to close windows for this to work.
Keyboard Maestro “Close Acrobat Pro Window when last document is closed” Macro
Close Acrobat Pro Window when last document is closed.kmmacros (4.9 KB)