Use the sidebar/content layout as the default with Genesis

functions.php

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

/**
 * Use the sidebar/content layout as the default with Genesis
 *
 * @author Reasons to Use Genesis
 * @link http://reasonstousegenesis.com/sidebar-content/
 */
add_filter( 'genesis_pre_get_option_site_layout', '__genesis_return_sidebar_content' );