I'm a student and have been using Canvas for a while. The new larger headers that "follow you" (not sure of technical term) and can cover up useful content.
I would like to be able to see both my assignment description and text entry box at the same time. To fix this I suggest having a "smaller header" or "old header" option in settings, similar to the previous one.
Here is a screenshot, from my 13" laptop:
As you can see, the header takes up nearly one third of the screen. I cannot see the assignment description while I write my response.