You can specify the order in which your learners will take the longread, turn on the chapters numeration, and enable a button that takes readers to a new chapter.
To start managing navigation settings of a longread, click the Settings link at top right corner and choose the Navigation tab.
Specify whether your users will have to take longread chapters one after one or randomly.
Turn on and turn off chapter numbering by dragging the slider.
That's how chapters list looks like with numbering enabled:
And if numbering is turned off, it looks like this:
Next Chapter Button
Add a button to move to a next chapter at the end of a previous chapter with the help of this slider.
If the option is on, the chapter looks like this: