The sim uses negative mouse acceleration, as far as I can see.
If you move your mouse very slowly, you will observe that you should be able to move your mouse across most of your mousing surface without the view moving much at all.
Now do the same thing, but now move the mouse faster, but at a steady pace. You should notice that over the same distance your view will change greatly.
It’s kind of like trying to walk around with a ball, and chain on your ankle!
Mouse look, camera controls, the interface…all of this is has been designed with one device in mind, and that is a console controller, not a mouse. So in that regard, you could sensible argue that there is no mouse acceleration. What it effectively does is completely ignore any mouse input at all below a certain speed!
I have one of those giant Steelseries mouse mats, nearly a half metre wide. I can move my mouse across it’s entire surface without moving my view one inch.
It’s not as bad as the more common form of mouse acceleration, the thing you see in the worst console ports on to PC, but it’s almost as bad, and I would dearly like to see the back of it.
Being able to detect mouse acceleration is not a difficult skill to learn. One trick I found years back was to use a reference point for your mouse, like the edge of your keyboard, or the edge of your mouse mat, and start from there. If you vary the speed of your mouse, moving from that position, at any speed you like, then back to that position, if your view does not return exactly where you were before then you have mouse acceleration.
As you can tell, I detest mouse acceleration.
I play many other titles, and it is one of the first things I look for, and disable if it is present.
I do not have it enabled in Windows either, from the console, or Razer Synapse. I use a Deathadder v2, for the record.