Now that you have added documents in your project you can access more options to manage them. 

1. Do a right click on the document that you are interested in, those options appears. 
2. By selecting several files and clicking on <X element selected> other functionalities are accessibles. 

You can also use filter to find a document  :

     3.Thanks to the filter  <File type> you can select the format of your documents.  

     4. Finally to look for a document trough his name or with a world from its content, use the search bar.

To learn more about the document page go here.