In MX 2004, the projector properties are in 2 places.
1) File, Publish Settings - specifically, the Projector tab.
the checkbox for fullscreen as well as a few other options
2) click on a blank part of the stage and look to the
Inspector, and go to the Display Template tab. Here you have
titlebar options which is (I think) what you are asking about
specifically. Uncheck Visible to make that go away.