Customize Rise Course Menu (CSS) + Fold/Unfold Rise Course Menu


I would like to know if it is possible to customize the display of the menu, in an Articulate RISE course by modifying the CSS (if modifying the CSS is possible). If so, what would be the method to customize the menu?
Also, is it possible, when launching a RISE module, to have all the categories "folded", because they are all unfolded, which makes the menu much longer. The idea is to unfold what is necessary (when it's necessary).

Thank you for your answers,


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