I often use the NodeRed Editor from my android phone (6.1 inch display size) and I find it very responsive and good for small changes, but one little thing is still annoying:
The "deploy" Button is not visible, so I have to switch to desktop mode just to deploy my changes.
I'm using NodeRed V3.0.2.
For me, it's also kind of an "emergency solution" for things that need to be done right away, e.g lights being constantly overridden by the system and therefore are uncontrollable, or for small changes when I don't want/have the time to boot up my Laptop just to do a small modification, but it really works pretty well for what i'm using it
That matches my size, and I wonder why it's different on your device than on mine.