experimental lab for seeing old documents

Terry Gladfelter

Áine.ní.Donnghaile

Making a guess, I suppose you are referring to Full-Text Search.

Full-Text is no longer a Labs experiment but is now in general use. It is not yet available on all records, but it is on many.
You can access it in several ways. I have this option bookmarked: https://www.familysearch.org/en/search/full-text