Select UserList, and in the right pane, right click on any blank space, and point to New -> DWORD (32-bit) Value.
Name the new DWORD registry value name as the exact same name that match the name of the user account to be hidden.
For example, if the user ID of the user account is John, the name the registry value as John.
Double click on DWORD registry value, and set the value data to 0 in oder to hide the account from Welcome Screen.
Tip: To display the user account on Welcome Screen again so that it’s visible again, delete the registry entry, or set the value data to 1.
Exit Registry Editor.
Log off or restart computer to make the change effective.