Amy,
It looks like the import process is only checking if the user has the capability moodle/backup:backuptargetimport allowed in the target course(s), which of course a user will have by default if they enrolled in it as a Teacher. Import does not know or check if the course is hidden from the user. In fact, it doesn't even bother to check if the user enrollment in the target course is suspended or not
A possible workaround is: If you change the enrolment in the target course so the teacher is actually in the non-editing teacher role, this will do what you want.
Or if you don't want to use that non-editing role for some reason, you could clone the Teacher role, remove the import permission from it, and change the user enrolment role from teacher to this new "no-import-from" teacher role in the target course.
In either case, both accomplish the same thing: the course will not show up on the list of courses to import from because the user does not have that capability allowed there anymore. Of course, if you have a lot of courses, this would be a lot of work depending on why you are hiding the courses from the teachers (eg old archives you don't want them to see or use anymore but you need their enrollment still there.)
Randy
It looks like the import process is only checking if the user has the capability moodle/backup:backuptargetimport allowed in the target course(s), which of course a user will have by default if they enrolled in it as a Teacher. Import does not know or check if the course is hidden from the user. In fact, it doesn't even bother to check if the user enrollment in the target course is suspended or not
A possible workaround is: If you change the enrolment in the target course so the teacher is actually in the non-editing teacher role, this will do what you want.
Or if you don't want to use that non-editing role for some reason, you could clone the Teacher role, remove the import permission from it, and change the user enrolment role from teacher to this new "no-import-from" teacher role in the target course.
In either case, both accomplish the same thing: the course will not show up on the list of courses to import from because the user does not have that capability allowed there anymore. Of course, if you have a lot of courses, this would be a lot of work depending on why you are hiding the courses from the teachers (eg old archives you don't want them to see or use anymore but you need their enrollment still there.)
Randy