docs/Features/Admin-Panel/People/Login.md
Was the Registration pane of Settings. It is one Login: Allow group of checkboxes: each is ticked when the thing is allowed, and each saves on click.
Stored the other way round, because the fields are older than the wording:
disableForgotPassword and disableRegistration are disable flags, so the
checkbox shows the opposite of what is stored. Only the display is inverted.
Below the group:
DEFAULT_AUTHENTICATION_METHOD environment variable, when set, wins on every
startup.