1/n not working with payment rounding

I have a payment processor set-up on USD cash to round to the nearest dollar.

In the video below you will see that this is working correctly at first, but it I press 2 then 1/n the bill gets reduce to 33.95. When I try to pay this using Cash USD the entire bill gets paid for some reason…

I will probably never use the split, 1/n and balance buttons, so is it possible to just hide them?