Keep Meta box collapsed

I have found these two filters, that can be used to keep post meta boxes closed by default. However, this works for Yoast SEO because the $box_id = wpseo_meta is available, but there is no $box_id for this plugin?

add_filter( 'get_user_option_closedpostboxes_page', function( $closed, $option, $user ) {
	
	$closed[] = 'wpseo_meta';
	
	return $closed;
	
}, 10, 3 );

// OR with this filter

add_filter( "postbox_classes_page_wpseo_meta", function( $classes ) {
	
	$classes[] = 'closed';
	return $classes;
	
}, 10, 1 );

They will work on pages only here, but can be on posts or cpt by switching screen_id and box_id postbox_classes_{$screen_id}_{$box_id} and get_user_option_closedpostboxes_{$screen_id}

• This reply was modified 3 years, 5 months ago by Vayu Robins.

Hi @vayu

The ID of the meta box is members-cp, so can try to use this in your code and see if that helps?

Best

Thanks @caseproof!
This works:

add_filter( 'get_user_option_closedpostboxes_page', function( $closed, $option, $user ) {
	
	$closed[] = 'members-cp'; // Members plugin
	
	return $closed;
	
}, 10, 3 );