Since this question is on Digital Editions rather than the Adobe Digital Enterprise Server, I have moved your question to that forum. The question (or feature request) in English, courtesy of Google translation, is
"I have about 500 books in my Adobe Digital Editions staan.En if I want to read a particular book
I miss the search function in this program" with the title "Search Function." If you want to clarify the question, this would be a good time, as the Google translate is not the best.
Europe, Middle East and Africa