How to add layout settings to custom post type.

cpt-layout-support.php

<?php
//* Do NOT include the opening php tag, only copy the code below

//* Register custom post type example
add_action( 'init', 'portfolio_post_type' );
function portfolio_post_type() {
	register_post_type( 'portfolio', array(
		'labels' => array(
			'name' => __( 'Portfolio', 'bizznis-child' ),
			'singular_name' => __( 'Portfolio', 'bizznis-child' ),
		),
		'has_archive' => true,
		'public' => true,
		'show_ui' => true,
		'show_in_menu' => true,
		'rewrite' => array( 'slug' => 'portfolio' ),
		'supports' => array( 'title', 'editor', 'bizznis-layouts' ),
	) );
}