Ok, so I had a look under the hood, and what happens is this:
- If Show Page Name is turned on, the system will display the current page's name at the top of the main screen - if the page has one
- If Show Page Name is turned off, the system will briefly display a page name when you change pages
I agree that it would make sense to have a setting that causes it not to display a page name at all. For now, if you clear out the names from all of your button pages, you won't see anything displayed when you change pages.
EDIT: I should mention that you need to clear out your page names AND (ironically) turn on Show Page Names to get no page names to appear.