I don’t know about this view. I use an older version. If I was cutting a 12mm thick piece, I might do this:
Total depth (on the toolpath): 13mm (it is a through cut)
DOC per pass: 4.34 (13/3. I might not be able to do 13/2, so I choose the next smaller. There’s no point in doing something like 5.5, because it will take three passes anyway)
Finishing tool max depth: 15mm (or anything over 13).
Finishing offset (I can’t remember the name, but it is a toolpath setting): 0.1mm
In my experience, that makes it cut 0.1 away, in three passes down to 13mm. Then it follows one more time on the line, at a depth of 13mm (make sure your bit has enough cutting depth, the shaft won’t cut anything).
I always check that in the preview first. I have hit some settings that double the depth, and it was clear in the preview. Specifically, there is a setting on a toolpath to choose a start depth and a total depth. Those get added together. If it starts at 10mm, and has a max depth of 10mm, it will end at 20mm. That has bit me.