This setting controls whether details such as email address or domainusername appear with the username on the sign-in screen. For clients that run Windows 10 version 1511 and 1507 (RTM), this setting works similarly to previous versions of Windows. Due to a new Privacy setting in Windows 10 version 1607, this setting affects those clients differently. Changes in Windows 10 version 1607 Beginning with version 1607, new functionality was added to Windows 10 to hide username details such as email address by default, with the ability to change the default to show the details. This functionality is controlled by a new Privacy setting in Settings > Accounts > Sign-in options. The Privacy setting is off by default, which hides the details. This Group Policy setting controls the same functionality. This setting has these possible values: - User display name, domain and user names: For a local logon, the user's full name is displayed. If the user signed in using a Microsoft Account, the user's email address is displayed. For a domain logon, the domainusername is displayed. - User display name only: The full name of the user who locked the session is displayed. - Do not display user information: No names are displayed, but for all versions of Windows before Windows 10, the full names of users will be displayed on the Switch user desktop. Beginning with Windows 10 version 1607, this option is not supported. If this option is chosen, the full name of the user who locked the session is displayed instead. This change makes this setting consistent with the functionality of the new Privacy setting. To have no user information displayed, enable the Group Policy setting Interactive logon: Don't display last signed-in. - Blank: Default setting. This translates to 'Not defined' but it will display the user's full name in the same manner as the option User display name only. Hotfix for Windows 10 version 1607 Clients that run Windows 10 version 1607 will not show details on the sign-in screen even if the User display name, domain and user names option is chosen because the Privacy setting is off. If the Privacy setting is turned on, details will show. The Privacy setting cannot be changed for clients in bulk. Instead, apply KB 4013429 to clients that run Windows 10 version 1607 so they behave similarly to previous versions of Windows. Interaction with Block user from showing account details on sign-in For all versions of Windows 10, only the user display name is shown by default. If Block user from showing account details on sign-in is set, then only the user display name is shown regardless of any other Group Policy settings. Users will not be able to show details. If Block user from showing account details on sign-in is not set, then you can set Interactive logon: Display user information when the session is locked to User display name, domain and user names to show additional details such as domainusername. In this case, clients that run Windows 10 version 1607 need KB 4013429 applied. Users will not be able to hide additional details. Best practices Your implementation of this policy depends on your security requirements for displayed logon information. If you run computers that store sensitive data, with monitors displayed in unsecured locations, or if you have computers with sensitive data that are remotely accessed, revealing logged on user's full names or domain account names might contradict your overall security policy. Depending on your security policy, you might want to enable the Interactive logon: Don't display last signed-in policy.
Windows Settings/
Security Settings/
Local Computer Policy -> Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options
After changing group policy options, you need to update group policy. If you do not update group policy then settings will not effect. To update it just simply type below command and also sample image is shown.
gpupdate /force
In about command we used "/force" option, this will help up to update policy options forcefully.
