Most core enrollment plugins showcase settings in a consistent manner:

• 'edit' icon in the Enrolment Methods page ( /enrol/instances.php?id=COURSE_ID )
• submenu item under Course Administration > Users > Enrolment Methods

On top of this, some plugins (like enrol_self) also show settings in the Course > Edit Settings page, for convenience.

However, enrol_guest only displays settings in the course settings page, and not in the Enrolment Methods section. IMHO this is not very user friendly, as various similar features (enrollment plugins) work in a different way.

I would expect enrol_guest to be able to be configured as any other enrollment plugin, from the Enrolment Methods page.