Vertical Simulation Distance

Sometimes the changelog mentions Endermen Farms. But none of these work for me. For some reason, when I go down, the farm just stop working, because the mobs just don't spawn.
Same thing for Monster Spawners.
The Simulation Distance slider only affects X and Z, but my farms need a higher Y range to work.
I have a Samsung Galaxy J5 2016.

(I'm trying my best to spell correctly)