I don’t know about Side-Scroller Controls with First Person Camera, but it is still not working properly when switching between combo of: Default Third Person Camera + Default Controls
And combo of: Default Camera or Fixed Angle Camera or Orbital Camera + Side-Scroller Controls
As it is described here: Side-Scroller device issue #1 in Fall Guys islands
If I leave a Volume Device that on leaving removes Side-Scroller Controls (and Fixed Angle or Orbital Camera, if it was added before) from my Character, I can control my Character normally, but if I use Grind Device or Ascender Device after that (= if I had previously Side-Scroller Controls active), movement of my Character is still broken = I can move only in 2 directions while I am able to rotate camera around in all directions.