If I have selected a file, to see its details etc. it's not obvious how to unselect it so I can go back to viewing the folder details.
I tried clicking on the whitespace (windows analogy) but it did nothing. After some random clicking about I found, to deselect I must click the "xxxx is selected" text at the top of the page. This doesn't seem intuitive. Perhaps adding a "cancel" cross next to it, similar to the "clear" buttons in search boxes would provide a clue.