How do you hide the subject field of iMessages on OS X? Is there a way to hide the subject field of messages which appear in the top right corner of the screen when I receive an iMessage on my computer? I know there is a way to hide it on messages that come to my iPhone. Is there a way to do the same on Mac OS X?
I'm not sure what you mean for sure, but take a look under System Preferences → Notifications as you might find your answer here.