Can't find Combine Rewrite

I can't find Combine rewrite for ASC/DESC replacment.
There is no option i view popup!

But in "better_exposed_filters_exposed_form_plugin.inc" I found this lines:

$bef_options['sort']['advanced']['combine_rewrite'] = array(
        '#type' => 'textarea',
        '#title' => t('Rewrite the text displayed'),
        '#default_value' => $existing['sort']['advanced']['combine_rewrite'],
        '#description' => t('Use this field to rewrite the text displayed for combined sort options and sort order. Use the format of current_value|replacement_value, one replacement per line. For example: <pre>
Post date Asc|Oldest first
Post date Desc|Newest first
Title Asc|A -> Z
Title Desc|Z -> A</pre> Leave the replacement value blank to remove an option altogether.'),
        '#dependency' => array('edit-exposed-form-options-bef-sort-advanced-combine' => array(1)),
      );

How to enable this rewrite?