Using the filter tool can be helpful for narrowing down a long reading list. It allows you to break down by resource type, importance setting and reading intention. An example of this would be filtering the list so that you are only shown the Essential readings:
You can also use the Reading Intentions menu (the round circle at the far right of each item), to mark a resource with options such as "Will Read" or "Have Read". You can then filter the list to show all the items you have marked under a particular intention.