[codecalec]

I was thinking the same as you. It seems to be another term for code folding. It is where you collapse parts of a source file into a single line so you can just focus on the part of the source file that you are interested in.

[dotancohen]

Like org-mode?

[fiddlerwoaroof]

It’s more like the literate programming parts of org-mode except Leo is more of a live view, from what I remember.