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add_action('wp_head', function(){
    ?>
    <style type="text/css">
        .b2bking_category_users_textarea_buttons_container{
            display: none !important;
        }
    </style>
    <script>
        jQuery(document).ready(function(){
            jQuery('.b2bking_category_users_textarea_buttons_container').remove();
        });
    </script>
    <?php
});