I investigated a little and reproduced your problem: it boils down to the fact that /courses is not the catalog, and the courses that are displayed there are unaffected by the visibility settings from the advanced settings. If you’d like to disable this page entirely, then you need to set FEATURES["ENABLE_COURSE_DISCOVERY"] = False in the lms settings. I suggest you create a small plugin to resolve this (and please post it here ;))
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