I've been searching about it and came across with this snippet code, will it disable safely the xml-rpc?

// set below line to false in /public_html/xmlrpc.php 
...
define( 'XMLRPC_REQUEST', true );
...

Update

I've installed and activated Disable XML-RPC plugin, but the wordpress security scanner still showing it is enabled!

(I'm newbie in wordpress/php code development )

Update2

I've installed wpscan and just use it to test my web site and here is the result for xml-rpc:

[+] XML-RPC seems to be enabled: https://..../xmlrpc.php
 | Found By: Link Tag (Passive Detection)
 | Confidence: 100%
 | Confirmed By: Direct Access (Aggressive Detection), 100% confidence
 | References:
 |  - 
 |  - /
 |  - /
 |  - /
 |  - /

[+] WordPress version 5.9 identified (Latest, released on 2022-01-25).
 | Found By: Rss Generator (Passive Detection)
 |  - https://..../feed/, <generator>/?v=5.9</generator>
 |  - /, <generator>/?v=5.9</generator>