// Add post navigation to CPT in Kadence - change portfolio to your CPT name

add_action( 'kadence_single_after_inner_content', 'add_post_nav_to_specific_cpt' );
function add_post_nav_to_specific_cpt() {
    if ( is_singular( 'portfolio' ) ) {
        echo '<div class="cpt-post-nav">';
        the_post_navigation( array(
            'prev_text' => '&laquo; %title',
            'next_text' => '%title &raquo;',
        ) );
        echo '</div>';
    }
}