iPhone X and iOS 11.2.6
On the main screen when an album is playing there is a very handy volume slider at the bottom when I'm playing my Qute 2. UNFORTUNATELY, I can't really slide the volume slider as the entire app instead wants to slide off the screen to the left or right. (This is happening on the commercial release version of the Naim App as well as the current beta version which I test).
It's been doing this for the past few versions. This is not NEW.
If I touch the general area of the volume slider, it brings up a different view of what's now playing, and on that screen I can use the slider down at the bottom without everything else sliding. But on what I call the 'home screen' that does have a volume slider, trying to slide that slider moves the entire window off the phone, as shown below. (I caught a screenshot while moving my finger on the slider):