How to group lessons in navigation bar?

Hi,

Follow these steps in Rise:

1. Start a new course
2. If you want to add a lesson title, such as "Accessibility Resources" in your image, just type in the title where it says "Add a lesson title..." and hit Enter.
3. If you want to add a Section Header, such as "Bonus Content" in your image, just type in the section header name where it says "Add a lesson title..." and hit SHIFT + ENTER.
4. Continue creating your lesson titles and section headings.
5. If you need to rearrange lessons, click and drag them.
6. Once the course is launched, the appropriate lessons should display in your navigation under the appropriate section headings as in your image above.
7. If you don't see this, try going to Theme>Navigation and choosing a Sidebar option.

SHIFT + ENTER. I didn't read the small text. (。_。)

It is kind of small. :)