Esconde categorias do painel

hide_categories_in_the_category.php

<?php 
function the_category_filter($thelist,$separator=' ') {
    if(!defined('WP_ADMIN')) {
        $exclude = array('A', 'B', 'C', 'D');  //as categorias para esconder

        $cats = explode($separator,$thelist);
        $newlist = array();
        foreach($cats as $cat) {
            $catname = trim(strip_tags($cat));
            if(!in_array($catname,$exclude))
                $newlist[] = $cat;
        }
        return strip_tags(implode($separator,$newlist));
    } else {
        return $thelist;
    }
}
add_filter('the_category','the_category_filter', 10, 2);
;?>