Remove total theme metabox from portfolio CPT

This is the snippet:

//hide meta box from portfolio
add_filter( 'wpex_main_metaboxes_post_types', function( $types ) {

	// Add to my custom-type post type
	//$types[] = 'portfolio';

	// Remove from blog posts
	unset( $types['portfolio'] );

	// Return post types array
	return $types;

}, 40 );