postbox_classes_{$screen_id}_{$box_id} WordPress Filter Hook

The postbox_classes_{$screen_id}_{$box_id} hook is used to add custom classes to a postbox on a particular admin screen. This hook is useful for targeting specific postboxes and adding custom styles or functionality. For example, you could use this hook to add a 'hidden' class to a postbox, which could then be used to hide the postbox by default using CSS.

apply_filters( "postbox_classes_{$screen_id}_{$box_id}", string[] $classes ) #