The plugin does not work with theme sidebar and other shortcode plugins. And can i customize the labels?
Thanks for your query.
I found you are using Books Showcase plugin.
Can you please mention your site link & write more details with screenshot?
Books Showcase Widget available to add at widget area.
Please have a look http://bookshowcase.gsamdani.com/gs-book-showcase-widget/
You can mail with screenshot at samdani1997 [at] gmail.com