Why doesn't slidesToScroll work in slick slider when centerMode is enabled?

Question

css

only moves one slide

$('.cases-slider').slick({
  slidesToShow: 4,
  slidesToScroll: 4,
  speed: 900,
  rows: 2,
  infinite: true,
  arrows: false,
  centerMode: true,
  centerPadding: '250px',