This article explain on how to disable windows update on Windows 10/11 client devices.
https://www.thewindowsclub.com/windows-10-update-enables-even-turning-off
here they are actions that you need to know:
a) Disable Windows Update using Windows Services
b) Change the Log on account for Windows Update Service (logon as .\guest user with blank password)
c) Turn Off Windows Update using Group Policy --> gpedit.msc --> Go to Computer Configuration > Administrative Templates > Windows Components > Windows Update > Manage end user experience. --> Configure Automatic Updates setting. --> Disable
d) Disable Windows Update Medic Service (consider that this service [or WaaSMedicSVC using Windows Update Blocker.]) is a service introduecd to repair Windows components.