This won't help everyone but it helped me - I was unaware of changes being made to shared notebooks and I need to know what they were and when they happened. Evernote for Mac uses the notification centre feature in OSX. You can configure it to notify you of recent changes using either badges or alerts. Badges appear and then disappear, whereas alerts remain onscreen until they are dismissed. I configured alerts from the default Banners style to the "Alert" style used system preferences to make Evernote the top of my Notification Centre list. Now I get notified of changes or additions in shared notebooks and if i want quick access to then I can use notification centre to do that.