Text indexing problems, what is hidden under the "Read more" button?

Question

Search Engine Optimization

Once again I run into the problem of indexing the text of sections that are hidden under the read more button. I found many examples where the text under the button is unique and not indexed, after years of existence of stores. I also noticed in my project that the text that was successfully indexed and hidden under the cut crashes after a while and again 100% uniqueness according to TXT.ru, what's the matter? Interested in the opinion of experts who ran into this problem? Do you hide texts under the "read more" button, do you have problems indexing such text? Does indexing interfere with the fact that stores hide the text and what are the ways to get rid of this problem?

Answer 1

if we talk about online stores, then they do not hide what meaning they have?