Mavic air : Unable to operate Gimbal/camera

I recently bought a mavic air along with the remote. While flying it, I am unable to tilt the camera gimbal (basically the camera movement) with the remote. The left wheel on top of the controller seems to control the camera exposure instead of the gimbal.
I am unable to figure out how to change it in settings.

Could someone please help me out.

Did you try upgrading or reinstalling the aircraft firmware?