Where can I see custom metadata or tags in WorkDocs?

While researching how to organize our transactional documents using WorkDocs, I saw this article stating that we can use the SDK to tag documents and folders and also that we can add custom metadata: https://aws.amazon.com/about-aws/whats-new/2017/06/amazon-workdocs-administrative-sdk-adds-apis-to-access-and-update-metadata-tags-and-comments/

However, I don't see any of this information inside the WorkDocs web app itself and I don't see any options to turn it on.

Suppose I used the SDK to tag two documents with 'Customer: Acme Corp' - how would I be able to search for them in WorkDocs?