Retaking courses created in Storyline after completing them

Hello Nora, 

Thanks for reaching out!

One way to allow your learners to go back to previous slides is to use the 'Restricted Navigation' option in the Player settings. Restricted means learners can view the current slide and any slide they previously viewed, but they can't jump ahead or skip over slides. With this option, your learners can open a course they've previously completed, and jump to any slide they'd like to review. Here's more information on changing the behavior of navigation in Storyline 360:

• Storyline 360: How to Restrict or Lock Navigation

Hope this helps!