How to make collapsible meta boxes

[bueltge]

How to make collapsible meta boxes

[x9t9]

I am not 100% sure I understand your issue, but if I do than you need to add the corresponding JS to your settings section ( postbox.js - you will find it in the admin/js folder or just use wp_enqueue_script('postbox'); ) .
Other option is write your own to make things short .

As far as I remember , it is indeed not included in the plugin.

[bueltge]

I have a small javascript inside an other plugin to close/open meta boxes. maybe this helps you.
https://github.com/bueltge/adminimize/blob/e27044bf79cf48fd20ec966a011224d8a50b811f/js/adminimize.js#L25-L32

I add, remove only the default css classes from the WP Core to hide, show the areas.

[ckristhoff]

Just as @x9t9 said:
wp_enqueue_script('postbox');
but, you must add next script:
jQuery(document).ready(function(){ postboxes.add_postbox_toggles(pagenow); });
voila!

[bueltge]

@ckristhoff I close this issue because in my opinion the question is clarified. If I'm wrong, please feel free to reopen it.