To have an easy overview of which documents have been signed you can export an Excel list of all sent documents.
There are two export options on the 'My documents' page:
1. Export: this is an export of all documents. The signer column can contain multiple signers.
2. Export signers: this is a more detailed export of all documents per signer. The signer column only has one signer, but if the SignRequest has multiple signers there will be multiple lines for that document in the excel. (One for each signer which allows for more detailed information, for example to export the input of the signer.)