Kind of minor detail… but one of things which makes experience inconsistent.
While other part of UI applies momentum scrolling, top menu (view selector) does not.
I suppose that vertical scroll comes from native browser abilities, while the horizontal scroll is div in a container.
Anyway, would look better and make the view consistent with other apps (at least in iOS)
Here are 3 videos
how top menu currently works
example from other application
Vertical scroll in HA, natively applies momentum scrolling