2 level categories navbar for galleries?

Hi,

I see in the code of the plugin that there is an implementation for hierearchy or at least for 2 level filtering for subcategories, but i can’t make it work with the shortcode ( i thought it could be with category_style=”category-two-level” or category_two_level=”true” but no luck)

Could you tell me how I could have that on the frontend? like see all top categories and dropdowns for subcategories, even just 2 levels is ok.

Thank you so much.