Click on a document in the displayed list to view it. 
or
Click the Action button associated with a document and select Preview.

• the  document tag, or
• the client who has been assigned the document, or
• the person who uploaded the document

for either your Sent or Received documents.

Click Apply.

To remove the filter, click the Filter button and then Reset. Or click Reset filters on the message displayed across the top of the page indicating that you've filtered your documents list.

If a document is associated with a task, you'll be able to view the details of a task.
Simply click the Action button associated with the document and select View task.
or
Click the task icon associated with the document. The task icon is just before the Action button.