I have mine by the spindle start/stop buttons!! It's easy to do, look at the button on the diagnostics page, in the screen editor, IF it's there, and just duplicate it in a new spot on the main page near the spindle controls. I added that and a box to show the top speed of the selected range (was pulley in Mach3!). I have a step pulley Bridgeport clone, so 9 ranges for me, 4 of them reverse.
If all else fails and there is no RANGE selector in the new wx4 screen, go get it from the old wx4 and create it in the new wx4, assuming you LIKE the new wx4 dark look!!