Here is a solution. (ONLY DO THIS IF AND ONLY IF YOU HAVE AT LEAST SOME BASIC UNDERSTANDING OF PHP)
1. GO TO YOUR WORDPRESS INSTALLATION FOLRDER
CLICK wp-conten –> plugins –> facebook-for-woocommerce –>
RIGHT CLICK + EDIT THIS FILE –> facebook-commerce-messenger-chat.php
2. SCROLL DOWN TILL YOU FIND THIS CODE:
public function inject_messenger_chat_plugin() {
if ( $this->enabled === 'yes' ) {
REPLACE “yes” WITH “no”
CLICK SAVE.
3. REFRESH YOUR SITE AND SEE IF IT WORKS.