If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
While I don’t know of anyway to disable the search function of wordpress, you can remove the search form with a bit of css. Try adding the following CSS to your Quick CSS (located under the Styling Tab in the theme options) or the custom.css file in the css folder of your theme files:
Is there no option to use a Child Theme for all the custom changes to the theme?
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