How to set up controller for Dirt4 on steam deck? Cannot turn

Hello all, we just installed Dirt4, and we tried to use a PS4 controller, and tried to use the Deck's own controller. Neither allowed us to turn with any of the control. Is there any way to set this up properly?

We can use the Right Trigger to accelerate, triangle to change view...just no button lets us turn left/right.

Thank you.