Thanks for this guys was very helpful. If you don’t want to replace the existing style just use .= to append your style, simply remember to have it be a space before your class.
And if you need to only affect a specific metabox you can use the $content[‘ID’] to compare.
Here’s what I’ve done to add Woo’s hide_if_external class to remove my metabox for external products;
function change_style_test($content) {
if ( ! empty( $content ) && array_key_exists( 'ID', $content ) && ! empty( $content['ID'] ) && $content['ID'] == 4970) {
$content['style'] .= ' hide_if_external';
}
return $content;
}
add_filter('acf/get_field_group', 'change_style_test');
All the best,
Cheers
