X Box 1 Controller - Auto gear change

Yes, I prefer to drive with automatic. For some reason. something happened today and I can no longer drive with auto. I have tried and looked at "Controls", within Assetto Corsa, use xbox 360, default (as I have been using for over 2 years). At least I can drive manually , but I am hopeless.

Can anyone please pleas please, advise how I can get back to using auto gear change.

Helppppppppppppppppppppppppppppppppppp