Can't assign DS4 button in Content Manager for DRS

Rogerbee

500RPM
May 2, 2018
567
71
50
Hi,

I drive in Assetto Corsa on my PC with a Dualshock 4. No matter which buttons I press, Content Manager will not let me assign a controller button to activate DRS on the RSS Hybrid cars. I was able to assign them for menus and my headlights, but, it will not accept any button for DRS. If I'm racing and the AI's are using it, I want to as well. What do I do? I can't keep taking my hand off the controller to press a key.