If your folder is set to show 'Details' then there will be column headings such as 'Name', 'Date Modified', 'Type' and 'Size'. Clicking on a column header selects that as the means of sorting (or, if that means is already selected, reverses the order).
So, for example, if you click on 'Date Modified' it will put the files into date order. If you click on it again, it will put them into reverse date order.
Similarly, clicking on the 'Name' header puts the files into alphabetical order. Clicking on it again puts them into reverse alphabetical order.
I hope that helps.
By the way, I spent over half an hour yesterday trying every Google trick I know to search the book reviews on the Daily Mail website and I still couldn't find any relevant references to 'class', 'painter' or 'Oxford'. Sorry!