Param 15 (Level After Power Restored setting) for Inovelli Z-Wave 2-1 VZW31-SN

I just got one of the new Inovelli 2-1 Z-Wave switches. I am trying to set Param 15 so that it goes back to where it was when the power went off. But there are 2 choices for 0 (zero). One is "Off" and the other 0 is Use previous level. So how do I set it to Use Previous Level?

Must be a typo in the driver. 0 is off, and 100 is previous state, according to the manual. 100 is also the default, so you shouldn't need to change anything if that's what you want (at least according to the manual; I see the driver again says something else).