Locating the Invert Pan feature

We recently had a consulting LD design a layout and patch some new fixtures. The problem is, the pan on the new ones pan left with an increase in value and right with decrease in value, which seems counterintuitive and opposite the existing fixtures. It’s confusing, especially when busking with a trackball.  

I know that there is a way to invert the pan, but I can’t find it. Can someone help?