ArtfulPussycat

<?php

function my_remove_default_et_pb_custom_search() {
	remove_action( 'pre_get_posts', 'et_pb_custom_search' );
	add_action( 'pre_get_posts', 'my_et_pb_custom_search' );
}
add_action( 'wp_loaded', 'my_remove_default_et_pb_custom_search' );

function my_et_pb_custom_search( $query = false ) {
	if ( is_admin() || ! is_a( $query, 'WP_Query' ) || ! $query->is_search ) {

ArtfulPussycat

<?php
/**
 * Plugin Name:       Your Functionality MU-Plugin Name
 * Plugin URI:        http://example.com/plugin-name-uri/
 * Description:       This is a short description of what the plugin does. It's displayed in the WordPress admin area.
 * Version:           1.0.0
 * Author:            Your Name or Your Company
 * Author URI:        http://example.com/
 * License:           GPL-2.0+
 * License URI:       http://www.gnu.org/licenses/gpl-2.0.txt