User not listed on login screen

[palazzo]

At some point when using El Capitan, I moved one of the home folders out of the startup disk and onto a second internal hard drive, due to space constraints. This caused that user to no longer show up on the list on the login screen, though it could still log in by selecting "other…" and typing the username and password. It also appears normally in the "Users and groups" system preferences. I later bought a larger hard drive and moved the home folder back onto the startup disk, but the user would still not show up on the login screen. Upgrading to Sierra, then High Sierra, changed nothing to this situation. Restoring the system on a new Mac through a time machine backup also did not make the user visible at login. Is there a way to force the user to appear on the login screen again? (Just for the heck of it; there is no actual loss of functionality from the user not showing up).