Indexing in Kindle Fire HX 10 7th gen

I read in another forum here for Kindles how to check to see how many books one has that still need to be indexed. I have a large library that I am trying to load from Calibre on to my Kindle Fire. The process is to search in books for either a nonsense word or a word that could be in one of my books. There is supposed to be a "search everywhere" button but I don't have that option in my Fire. Now what? I would like to see the progress of indexing my books.