I need to set the lan manager authentication level back to "not defined" in security settings in Windows 10 Pro.
Network Security: LAN Manager authentication level”

I changed this to another value by accident and cant find a way to put it back to "not defined". This is preventing the windows 10 client from being able to contact the domain controller and authenticate for domain access. Was working fine till I changed it while trying to get symantec endpoint protection manager to connect to the client.
Any Ideas?
Jeff