Set One Page To Full Width

function full_width_layout_single_posts( $opt ) {
//specific page by Post ID
if (is_front_page) {
    $opt = 'full-width-content'; 
    return $opt;
    } 

return $opt;
}
add_filter( 'genesis_pre_get_option_site_layout', 'full_width_layout_single_posts' );