Add Email Filter

functions.php

<?php
// Add the input field
function add_email_filter() {
    global $typenow;
    
    if ( 'shop_order' == $typenow ) {
        $current_emails = isset( $_GET['filter_emails'] ) ? sanitize_text_field( $_GET['filter_emails'] ) : '';
        echo '<input type="text" name="filter_emails" placeholder="Hide orders by email" value="' . esc_attr( $current_emails ) . '">';
    }
}
add_action( 'restrict_manage_posts', 'add_email_filter' );