There are a lot of features in Canvas that I don't know how to use or don't know are available. It would be great if every page had a "?" or "help" button that would give some quick information and help links for functionalities on that page.
For example, I have been using Canvas for 2+ years and only recently learned from someone else that the blue and red coloring in the gradebook indicate if an assignment is missing or late and why sometimes the "not-graded" icon would show up. Similarly, I only learned today that there are different ways to view the gradebook.
If the "?" icon was on every page, then on the gradebook page, clicking it might produce a popup displaying something like the following: