Meta Slider - Fixed Carousel

function metaslider_fixed_carousel($options, $slider_id, $settings) {
    $options['minItems'] = 4; // min number of slides that will always be displayed. Slideshow will be scaled down if necessary.
    $options['maxItems'] = 4; // max number of slides that will always be displayed. Slideshow will be scaled up if necessary.
    return $options;
}
add_filter('metaslider_flex_slider_parameters', 'metaslider_fixed_carousel', 11, 3);

This doesn't change the minItems value. Stays at 1. Also had to change priority to 10 to get the filter to work.