3D FlipBook - open the search field with the 🔍 button

Hello,

Until now, I had been using 3D-FlipBook version 1.15.2. Today I installed version 1.16.19.

I made the following change: templates > default-book-view.html I commented out one line:

Question: The 🔍 button does nothing. No action. I can access the search via bookmarks. The search also works as expected.

What do I need to do to open the search field with the 🔍 button?

https://www.otto-riehl.de/ebook/3d-flip-book/e-book_a1_en.html