We get asked from time to time how to remove the search from the navigation menu in any theme that has this as an option. It's the same process for any of our themes that have this in the navigation.
Navigate to APPEARANCE > EDITOR and click on the functions.php file on the right hand side of your screen.
Look for the code that looks like this:
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And then you'll completely remove it and save your file. Make certain that you get that last closing symbol or else you're end up with a white screen of death.