But how can I do it so it just affects Trainz? I did not find a setting for that.
As said, I use the mouse to look around in Driver and Surveyor, and it feels like it is inverted, at least in Cab view. But i'll try again.
Maybe there could be a setting for mouse sensitivity in the control settings... before it felt smoother.
Maybe- In game settings > Interface > Compass speed
Also check your Camera behavior slider to make sure it's your preferred setting.