***For those who would rather not read the full story: ABS is disabled by removal of the 25A ABS pump fuse, accessed by removing the front battery pack.***
I found the ABS feature on my 2015 ZERO FX to be undesirable, and literally dangerous for off-road riding(I came very close to ending up stuck in a stinky mangrove bog hole one time, when I forgot to turn it off!). Thankfully, ZERO appears to have known this, and did provide a way to turn ABS off at start-up, by holding down the "ADJ" and "MODE" buttons. Although it can be turned off, I hated having to do that every time I turned the bike on, especially if out adventure riding, and turning the bike off and back on frequently(to save power, of course!). Not only that, but I'd have to make sure I remembered to turn it off, and was constantly second guessing myself! After that, I would also have to cycle through the mode switch every time, just to get back to the previously set riding mode.
So, recently, I discovered in a Youtube comment, that ABS can be turned off semi-permanently on a vehicle, just by removing the fuse! It's apparently an old trick used by mechanics while working on brakes(handy to know, too!). I got excited, and could barely wait to see if that trick would work on my FX; I was worried that somehow the main computer would recognize that the fuse was missing, and refuse to power the motor, like the one time I disconnected the ABS sensor in an attempt to disable ABS!
To my surprise and relief, pulling the fuse did disable ABS! I'm very, very happy about that! A side effect is that the ABS warning symbol will appear on the dash, but that could be a good thing if someone else rides your bike.
This should work on any bike, but on a 2015 ZERO FX, you just need to pull out the front battery pack to gain access to the 25A ABS pump fuse; it's enclosed in an pinkish coloured holder. Check the manual on page 5.28 if you're unsure. I've got my fuse duct taped to the outside of the holder so that it doesn't get lost, or for if I ever need to refit it.