New Change in SharePoint Designer 2013.
The Design View no longer exists in SharePoint Designer
2013. This changes the way we work with (or used to work with) all sorts of
visual elements in SharePoint.
Please refer the below link for more info.
http://blog.sharepoint-videos.com/sharepoint-designer-2013-data-view-web-part-list-view-web-part-design-view-is-gone/