Question Freelook camera on touchscreen. Joystick interferes

I have a touch joystick (standard Unity UI asset) and a freelook camera (following character controller) that is controlled by inputs Mouse X and Mouse Y. When I use the joystick to move the character on touch screen, the camera moves too. Can I create a null zone at the bottom of the screen that the joystick is placed in that doesn't push Mouse X and Mouse Y values to the camera? Or is there some other way to handle this competing input problem? I am sure I am not the first to encounter this, but I can't find a clear, simple workable solution to this problem via these forum threads yet.