To bring up the Controller Settings menu, select 'Settings' -> 'Controller Settings' from the Quick Menu that displays before each race. From there you can adjust your controller and steering wheel sensitivity settings. The Controller Settings are as follows:

Buttons Assign
Change the buttons that have been assigned to race controls.

Controller
・Controller Steering Sensitivity
Adjust the steering speed and response speed of the front tyres in response to input from the wireless controller. Lower values produce slower response times, which allows for smoother steering. Higher values makes the tyres' response faster and more sensitive.

Steering Force Feedback
・Force Feedback Max. Torque
Adjust the maximum torque. This is an example of force feedback, which communicates information about the road surface to the driver through their tyres. The greater this value, the duller the response from the tyres when cornering hard. The lower this value, the more responsive the car becomes.

・Force Feedback Sensitivity
Adjust the resistance of the steering wheel when you start to turn it. This resistance is an example of force feedback, which communicates information about the road surface to the driver through their tyres. The greater this value, the more responsive to changes the steering wheel will become. The lower this value, the more gentle steering becomes when driving in a straight line.