What kind of screenshot do you expect?
I included this one:
Does it work if you try while being logged out?
Maybe you can see more categories here than me. I think some kind of limit was added if there are less than 10 categories which results in hiding search.
Or more categories are loaded for you because of the ones you configured for your sidebar. I have only one category there (because 0 isn’t possible, then I get all the default categories)