functions.php

/**
 * Use Full Content for Features in Grid Loop
 *
 * @author Bill Erickson
 * @link http://www.billerickson.net/code/full-content-features-in-grid-loop
 *
 * @param string $option
 * @return string $option
 */
function be_full_content_for_features( $option ) {
  if( in_array( 'feature', get_post_class() ) && is_home() )
        $option = 'full';

    return $option;
}
add_filter( 'genesis_pre_get_option_content_archive', 'be_full_content_for_features' );