Enable the block editor for Genesis Portfolio Pro

genesis-portfolio-pro-modifications.php

<?php
/*
Plugin Name: Genesis Portfolio Pro Modifications
Description: Enable the Block Editor for the Portfolio post type.
Version: 1.0.0
*/

add_filter( 'register_post_type_args', 'studiopress_enable_block_editor_portfolio', 10, 2 );

function studiopress_enable_block_editor_portfolio( $args, $post_type ) {
	if ( 'portfolio' === $post_type ) {
		$args['show_in_rest'] = true;
	}

	return $args;
}

instructions.md

1. Create a file named genesis-portfolio-pro-modifications.php in your WordPress site's wp-content/plugins directory.
2. Paste the genesis-portfolio-pro-modifications.php code on this page into that file.
3. Activate the plugin.

You should then see the block editor active when you visit Portfolio Items -> Add New.