In iOS it’s a convention to “scroll to top” when tapping the top center of the screen. I seem to remember this functionality being present in the past, but I haven’t been able to do that on my device for several months at least. This works in the main screen and on the “All Stories” list, but it doesn’t appear to work when viewing an individual news item. Strangely, if you navigate to the actual website and click “done” this functionality works. It appears to be associated with the top bar that is hidden if you scroll down a bit. That top bar comes back when returning from the browser (I use built-in Safari) to the NewsBlur view.
I’m using the NewsBlur app version 10.0.1 on iOS 12.4.1. (If this is fixed in iOS 13, I’ll just upgrade)