I used to get my files displayed int the form of pictures on my sky drive. Thie is no longer the case, only folders with names are shown. How do I get back my picture display?

On sky drive I used to get my files displayed in the form of pictures, now I only get the file folders with a name. How do I get my  tiles with beginning pictures of a particular folder back? I like to see what is in the file before I send it somewhere. thanks for your help. jackie