Where can I find CIVIL_CROSSSECTION_REVERSE_STATION_ENABLE configuration variable?

I want to cut my cross sections in reverse station order. I came across a useful video on it on CivilTSG Youtube Channel teaching this exact thing in OpenRoad Designer, but I got stuck along the way. From the video it says that the variable configuration CIVIL_CROSSSECTION_REVERSE_STATION_ENABLE has been added for versions 10.8.1 and up? I'm at v. 10.10.1, but I don't see it in the variable configuration settings. Does anyone know how to retrieve it?

Link to the referred video:

https://www.youtube.com/watch?v=olwPl7YM5IA