Learning Fusion 360

OK, stupid question time: I'm new to CAD and Fusion 360. Why does the Z axis point the wrong way when I open a sketch in Fusion 360?

i.e. I have Z Up set in my preferences, and the geometry symbol shows Z up:

But in the Front view, the sketch Z axis has the values increasing going down:


I have visions of generating a program where all the Z axis moves are backwards to my intent. It's hard to think in terms of Z going down, when your mill has Z up.