[ Ultimate Carousel For Divi ] Change navigation button html using wordpress filter

function.php

<?php

// Filter to change the ultimate carousel navigation button HTML.
// Add it to your functions.php file of your child theme

add_filter(
    'uc_carousel_nav_button_html',
    function (
        $html,
        $nav_type
    ) {

        if ($nav_type == 'prev') {
            return '<div class="swiper-button-prev swiper-nav">D</div>';
        }

        if ($nav_type == 'next') {
            return '<div class="swiper-button-next swiper-nav">E</div>';
        }

    },
    10,
    2
);

style.css

/* Add the styles to your child theme OR on the Divi Page */

.swiper-nav.swiper-button-next,
.swiper-nav.swiper-button-prev {
    font-family: ETmodules !important;
}

.swiper-button-next:after,
.swiper-button-prev:after {
    content: none !important;
}