How do I set Views Bulk Operations Fieldset Collapsed by default?
Use hook_views_bulk_operations_form_alter()

&lt;?php
function mymodule_views_bulk_operations_form_alter(&amp;$form, &amp;$form_state, $vbo) {

 if($form['#form_id'] =='views_form_block_id'){

  $form['operations_fieldset']['#collapsed'] = TRUE;

 }

}
?&gt;