add_filter( 'get_terms', 'hide_category', 10, 1 );
function hide_category( $terms ) {
$new_terms = array();
foreach ( $terms as $term ) {
if ( $term->slug !== 'NAAM_CATEGORIE' ) {
$new_terms[] = $term;
} else if ( $term->taxonomy !== 'product_cat' || is_admin() ) {
$new_terms[] = $term;
}
}
return $new_terms;
}