Attributes/Options WYSIWYG not working

I'm trying to remove the Media Upload button from the editor using a frontend form. The field attributes linked to documentation: https://codex.wordpress.org/Function_Reference/wp_editor

Using MB Builder with this code:

         array (
                'id' => 'wysiwyg_6',
                'name' => 'WYSIWYG Field',
                'type' => 'wysiwyg',
                'options' => array(
                    'media_buttons' => false,
                ),
            ),

Result is: https://www.screencast.com/t/alRtjJOzaX1

What do I need to do to make the button disappear on frontend?

Thanks in advance!