Grouping of Lessons in AO?

How can I group lessons in Articulate Online instead of being presented the linear list of all titles? Suppose that instead of four lessons listed individually, I'd like two categories - Beginning, Advanced - with two lessons in each. I can build two front ends to link each set of lessons. How do I then conceal the lessons listings themselves so that users only see the Beginning and Advanced categories rather than each lesson plus the group choices?

TIA, I might be overlooking something obvious, but a quick search didn't pop up an answer.

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