On PC, playing with an Xbox One Elite controller, the advanced settings does nothing: dead zones, maximum input setting, … on both triggers and stick.
I don’t know if it’s caused by the October 1st FH4 update or the Windows 1809 update I installed yesterday, as I was mostly playing with a wheel before that.
I tried Forza Motorsport 7 and the advanced settings are working as usual, so it’s either the game or the controller’s driver in FH4.