There are certain buttons that are not visually obvious at a glance. For instance:
1. The add "+" visually gets lost next the filter box (perhaps coloring the "+" or an obvious "Add" button) may help.
2. When adding a Notebook, make it obvious that code can go in the space. Even though you will see a "Click here to enter code" after you click in the cell, it would be nice if it was perhaps white with the default text already in there for ease of use.
