Are your parts greyed out even after you set the cut/engrave parameters?
If so, you’re running into the same issue as I did.
Fusion360 Slicer emits a bounding rectangle around the entire “page” of output. Output as DXF and then import into Inkscape or Illustrator, ungroup, and delete the bounding box (along with whatever other noise it spews). If DXF import doesn’t work (Inkscape can be finicky), then import the PDF into Inkscape.
I detailed the process here (once I figured out what was going on):
Supposedly, there is an option to turn off the bounding rect emission from Slicer, but I haven’t tried to find it yet.