Yoast SEO problem #1197

add_action( 'cmb2_admin_init', 'yourprefix_register_demo_metabox' );
/**
 * Hook in and add a demo metabox. Can only happen on the 'cmb2_admin_init' or 'cmb2_init' hook.
 */
function yourprefix_register_demo_metabox() {
	$prefix = 'yourprefix_demo_';

	/**
	 * Sample metabox to demonstrate each field type included
	 */
	$cmb_demo = new_cmb2_box( array(
		'id'            => $prefix . 'metabox',
		'title'         => esc_html__( 'Test Metabox', 'cmb2' ),
		'object_types'  => array( 'page' ), // Post type
	) );

	$cmb_demo->add_field( array(
		'name'       => esc_html__( 'Test Text', 'cmb2' ),
		'desc'       => esc_html__( 'field description (optional)', 'cmb2' ),
		'id'         => $prefix . 'text',
		'type'       => 'text',
		'show_on_cb' => 'yourprefix_hide_if_no_cats', // function should return a bool value
	) );

}