littleego

18/33, both because those are my two fav focal lengths and I also think the 18 is the best lens of the bunch

Hi littleego,
Yes, you can turn it off. I have FN2 set to Focus Check (and had it this way for 3 generations of x-series.) You can cycle through the 4 choices, micro prism, split screen, peak highlights, and nothing.
When I shoot film using my Pentax Spotmatic, I never use the center split and instead focus using the any part of the screen by judging the sharpness of the image.
I've begun doing the same thing with my X-T5. For my purposes, Fujifilm has essentially killed manual focus aids - so I'm upping my game and going old school. I use focus check for the magnified view and focus "off the glass," no aids.

The old setup was better, but it seems Fujifilm is not concerned any longer with the usability of the products they make and sell - so carry on.  

Yes, yes you can, either through turning it off in the MF Assist set-up menu or by repeatedly long pressing the rear command dial to cycle through the MF assist options — the “off” option will either be called off or standard depending on which camera body you have.

A lot of these type of feedback was due to the Auto Focus Priority setting was set to Release instead of Focus.
That is the first settings I changed whenever I got a new Fujifilm camera.