Apple News ‘window size’ on iPadPro and iPhone

Does anyone know how to increase the window size when using Apple News? On the iPad , and iphone, if you open a story from AppleNew in the mail app it only appears in smaller ‘box’ in the Apple News app. I’ve found no way to get anything next to ‘full screen’. Actually called Apple support and they knew no way to make the viewing window larger. Anyone know what to do? See attached picture. Notice the box the article is in…relative to the size of the AppleNew app/screen. This makes NO sense to me!