in the Courses tab, it is not possible to distinguish closed courses from open courses. There is no indication whatsoever in the list/segmented view or on the infopage that the viewed course is actually closed. this is especially annoying in the case where a user bookmarked a course which got closed after a while. The bookmark is still there, but the membership to course or associated group was revoked.
while closed courses can easily be distinguished from others in the authoring section, users cannot tell a closed course from an open course.
when closing a course, some information should be added to either e.g. the course name by adding a (Closed) as affix, and/or adding information to the close status to the information page in the Overview section like:
"This course was closed."