Open dropdown menu when current page is open

I cloned this project based on Carbon System Design. And I love the template.

In the dropdown menu of the model, when the current page is open, the dropdown menu is open to show all the submenus.

But, on my site, the dropdown menu is close.

How is it possible to keep it open when the page is open?

Thanks!


Here is my site Read-Only: LINK

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