In the Compile window, the name in the Authors field is not used. The <$author>, <$name>, <$fullname>, and <$username> placeholders are equivalent according to the documentation. All those placeholders return the combined first and last name.
I use the Authors field for the pen name, but it never shows on the compiled manuscript. There is no workaround other than editing the compiled manuscript if possible depending on the output format.
Thanks,
Miik