In the Documents tab, you can sort the list of documents by clicking any of the column headers: Title, Type, Visibility, Created By, or Date Created. Clicking once will sort in ascending order, clicking again will sort in descending order. The arrow next to the column name will become selected to identify the sorting column.
You can also search documents by Title or by Type by typing in the Search documents text box in the top right. The documents will automatically be filtered as you type. If you wish to undo this filtering, simply delete any text in the search box.