This is what I sent to GitHub's feedback form (plus a few edits)
The new notifications page is blocking me from working on small open source projects!
The first thing I want to do is see the projects with the least new notifications. But you have truncated them off the bottom of the list! (The list down the left-hand side.)
With the old UI, I used to immediately scroll to the bottom, and interact with the small projects first, before reading the notifications of larger projects.
Why? Because these small activity projects are more likely to be projects with only a few contributors, where I can make the most impact. Sometimes they are even my own projects. These are usually the projects of most interest to me.