How do I remove the bar containing "this file claims compliance with the PDF/A standard" from the top of my document in Adobe Acrobat Reader as it wastes space?

Hi, in Adobe Acrobat Reader there is a message bar across the top of my screen saying "this file claims compliance with the PDF/A standard and has been opened read-only to prevent modification". But there's no close button on the bar. How do I dismiss it? 

This app is already wasting so much screen space with the title text, then a menu bar, then another tab bar, then ANOTHER menu bar, then this message too. It's ridiculous.