S670 grain loss monitor

Maybe a dumb question, but I just traded from 2005 9760's to s670's. They have 2630 screens in them.
Under the grain loss setting there is no seed size number, just a graph called sensitivity, under that there is the cal number.
There is no indication of seed size at all. Do I turn up sensitivity for small seeds, and down for large, or other way around?
Looking online, every reference I can find shows a similar page on the menu with a seed size graph, and a number.
Why would mine be different? 
I found a pic of what I expect to see,
2nd pic is my screen