In this Bridge Learn release (Mar 11) - Authors can archive Live Training Courses.
Archiving Live Training
Authors can archive Live Training Courses, similar to how Courses can be archived. Archiving will allow you to keep the Live Trainings list up to date and remove any content that is no longer relevant. Archived items are moved to the “Archived” ab on the Live Trainings list page and can be unarchived if needed. Learners cannot participate in any sessions, even if some occur in the future; no notifications go out to the users.