Adjust Resource Navigation Method
The drop down menu system currently used to navigate the available resources is a bit cumbersome. Perhaps review the way in which you navigate the subjects and resources? A structure such as that of Class Notebook could work, choosing the curriculum subject from the 'Sections' area, then the year group from the 'Pages' area, another tab next to that with the resource options and then show a preview of the resource where your working area would have been.
Colin @ MSFT commented
Interesting. Thanks, James. Keep the feedback coming.