The method you should use depends upon whether you're signing in with a Microsoft account or a local account. As 'User' is the default name for a local account, it's probably the latter. If so, use the Control Panel method here: https://www.windowscentral.com/how-change-account-name-windows-10-sign-screen
Thanks for that Buenchico - I have set up my name using the Control Panel (never thought of that!) as I do not sign in with Microsoft.
All ok now.
Regards
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