The search bar works as expected, its nice.
Deselection of the search bar feels more natural if you pressed Enter, similar to how you hit Enter in chat, as having to click feels awkward. I find myself hitting Enter frequently to deselect the search bar, since I'm so used to hitting enter in Chat, which also deselects.
Clearing the search bar is also awkward, as backspace is reserved for hiding the UI. It's hard to tell whether or not the search bar is selected since the cursor is very faint, so sometimes you hit backspace to clear text, but instead you hide the UI. It would be nice to have a button next to the search bar to clear the text for you.