Hi @Elisabeth-AnneM,
Did you just unpublish the module items are in, or the items themselves as well? I think you need to unpublish the items to remove them from the syllabus (even though the students won't be able to access them in a unpublished module, they'd see the listing on the syllabus).
As for the Zoom sessions, you'll likely need to delete those from the course calendar manually. While the course calendar is great for students, events in particular seem to be somewhat of a pain when doing an import, as you often end up with things on the wrong dates, or things that don't apply to the new course.
-Chris
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