I see that the search field is inside a hidden div and it only activates after clicking the search icon. The problem is, that one of the important events is not firing this way. Luckily, there is a very easy fix for that. Put this code in the site header of footer:
Thanks for getting back to me quickly. I did put the code in the header, in the <head> tag. Unfortunately this had no effect. Could you recommend anything else?
I see 🙂 The problem is that it’s almost on the top of the head tag, and the javascript files are not loaded yet. Try to locate the wp_head(); call in the template header file, and if you put it just under there, it should work then 🙂