functions.php

<?php

$args = array(
	'labels'              => $labels,
	'hierarchical'        => false,
	'supports'            => array( 'title', 'editor', 'genesis-cpt-archives-settings' ),
	'public'              => true,
	'show_ui'             => true,
	'show_in_rest'        => true,
	'show_in_menu'        => true,
	'show_in_nav_menus'   => true,
	'publicly_queryable'  => true,
	'exclude_from_search' => false,
	'has_archive'         => true,
	'query_var'           => true,
	'can_export'          => true,
	'rewrite'             => true,
	'taxonomies'          => array( 'category' ),
	'menu_icon'           => 'dashicons-media-code',
);

register_post_type( 'code', $args );