Hello
Use AppLocker: AppLocker is a feature in Windows that can prevent certain apps from running. You can create a rule in AppLocker to block the Quick Assist executable, which is found at %windir%\system32\quickassist.exe.
Use Windows Firewall: You can create a rule in Windows Firewall to block the Quick Assist executable from accessing the internet. This effectively blocks Quick Assist.
Disable Shared Experiences and Remote Desktop: Go to System settings (press Windows + Q, type ‘system’), open ‘Shared Experiences’, and disable it. Also, go to ‘Remote Desktop’ and disable it.
Always ensure to have a backup or recovery plan in place before making changes to system settings or configurations.