Override the default layout option with Genesis (longhand version)

functions.php

<?php
// Paste the code BELOW this line into your child theme functions.

/**
 * Override the default layout option with Genesis (longhand version)
 * 
 * @author Reasons to Use Genesis
 * @link http://reasonstousegenesis.com/default-layout/
 */
add_filter( 'genesis_pre_get_option_site_layout', 'rtug_default_layout' );
function rtug_default_layout( $layout ) {
	return 'full-width-content';
}