Multi-level menu using material design theme

For our docs site, we are trying to use a nest menu but so far haven’t been to able to achieve it. Ideally we would like to have n-level menus and last level having the table of content. However currently we are not able to get 3 level such


we get get-started and administer, and data management however administer is not clickable - and once we add data-structure page under data-management it moves data-management to the top of the menu.

Any hints or ideas as if this is even possible?

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I’m having this exact same problem and am wondering if it’s a function of the theme itself, or of Hugo?