Don't feel bad, I didn't know either until I went into the Engrave module and it popped up.
You and @pfeerick, and I are saying the same thing, and in the Advanced Settings for Engraving the only two options you do get are Movement Speed and Laser Power. That's it, that is what you can adjust, both are on sliders but you can also type an absolute number in the box.
I'm afraid we have not answered @vegasracer question though, as to how the information gleaned from the calibration chart is supposed to be applied to settings. For example, you print the chart on a piece of the material, and the -0.2 line just looks perfect. Great! So, what do you adjust? Where do you put the -0.2 in settings?
I'm kind of hoping @proclaim or someone from FLUX Team or another Engraver weighs in on this one, because we are a bunch of printerheads fumbling around for an answer. (Most likely just because it said laser in the title , like moths to a flame)