Month View shows 3 events, Week View shows 5

I read somewhere that Month View will show "+n" when everything won't fit in Month view.

I don't see a "+n" or "+1" in anything like that in Month View.

Is there a setting that I need to turn on so that Month View will hint that it is not displaying all events?

Month view only shows events for the building and calendar layers you have chosen. Week view will show you everything that is scheduled in the building you have selected. Including restrictions, and other units events.

This is probably what you are seeing.