Official comment
@Mike > With the mixer panel open, and deselect these crossfader assignments.

I just received the 800. I like it a lot. One question I have: Is there a way to disable the crossfader. The 800 doesn't have the switches with the "through" selection like the 1000 or other popular controllers. Is there a software setting to disable crossfader, or is there no way to do so? Thanks.
@Mike > With the mixer panel open, and deselect these crossfader assignments.

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Have you checked in the preferences under controller-Mixer where you can adjust the curve? I don't have one in front of me, but there might be an adjustment in the actual version of rekordbox that it comes with.
I do see a curve adjustment... but I don't see a way to disable the crossfader. Is there a "curve setting" that actually disables it?
I can't turn my cross fader off, even when I drag it to the off position in settings
@Nigel > Did you deselect the channel assignments as shown above?