Navigating between lessons?

Tell us what’s happening:
Sorry I realize this is very basic, but haven’t found how to do it.

How can I easly navigate between the lessons without doing the challenges (tests)?
I worked through HTML/CSS and am about to start the Projects. I would like to go back over all the lessons, quickly looking at each of them. I don’t want to do the tests again, just watching the lesson.

How do I do this?
The site forces me to back to the Curriculum page everytime, where I have to click on the next lesson. A “Next”-button on the lesson pages would solve this, but as fas as I see there is none.

The button to go to the next challenge only appears when you submit a passing solution. You can browse through lessons using the Curriculum page, but there isn’t a mechanism to just sort of flip through them.