If you can network deactivate the plugin and only activate it on the Genesis sites individually, that would be a good approach (it will prevent the plugin logic from running at all if Genesis isn’t active).
Otherwise, you could try creating a new plugin folder named ‘genesis-remove-sidebar-nag’ containing a single file named ‘plugin.php’ with the content below. Network-activating that plugin should remove the notification on all sites.
<?php
/**
* Plugin Name: Genesis Simple Sidebars Remove Nag
* Plugin URI: https://www.ads-software.com/support/topic/dismiss-requirement-message/
* Description: Removes the activation nag for Simple Sidebars.
*
* Version: 0.1.0
* License: GPLv2+
* License URI: https://www.opensource.org/licenses/gpl-license.php
*
* @package genesis_remove_sidebar_nag
*/
add_action( 'plugins_loaded', 'genesis_simple_sidebars_remove_nag', 11 );
/**
* Remove the notice that Genesis Simple Sidebars displays if Genesis is not active.
*
* @return void
*/
function genesis_simple_sidebars_remove_nag() {
if ( ! function_exists( 'Genesis_Simple_Sidebars' ) ) {
return;
}
remove_action( 'admin_notices', array( Genesis_Simple_Sidebars(), 'requirements_notice' ) );
}
