// Apply Full Width Content layout to Posts page, Single Posts and Archives.
add_action( 'get_header', 'sk_set_full_layout' );
function sk_set_full_layout() {
	if ( ! ( is_home() || is_singular( 'post' ) || is_archive() ) ) {
		return;
	}
	// Force full width content
	add_filter( 'genesis_pre_get_option_site_layout', '__genesis_return_full_width_content' );
}