The main page under the new Course Reserves tab is the "Reserve Items" page. From this page you can see all of the readings on digital and physical reserve for a course, access readings through tags, check the status of a requested reading, sign up for notifications and link to other parts of the Course Reserve service.
The image below is a visual guide to the functionality of the Reserves Items page in Canvas.
Under the Course Reserves tab you can:
Tag items with keywords (from the "add item" or "edit item" pages)
This guide provides instruction for using the new Course Reserves system.