How can I restore the normal layout of web parts. (ie full width, left, right). I am not seeing the full width.
Not sure about your full query. But assuming, you are trying to get different type of layout for your SharePoint page. SharePoint has different type page layout and site template settings as its own features. You can use from those. Or you can create a customized layout of your own. And to built a customized layout you can use Microsoft SharePoint Designer.