Long-text fields (such as Description) only display two lines of text by default. To display more than two lines, you must modify the markup code in the associated Visualforce page. Follow these steps:

  1. In Salesforce, click Setup.
  2. In the App Setup area, click Develop and click Visualforce Pages.
  3. Find the name of the Visualforce page associated with your view, and click its Edit link.
  4. Add the following code after the starting 
    <apex> tag:<style> .longtext { max-height: inherit !important; }</style>
  5. For example: 
  6. Click Save.

Here is an example of the result: