Expand menu after click

Hello support,

I’ve just purchased your plugin. The plan is to expand the items after clicking.

So on this page

https://pijnmc.nl/waar-is-uw-pijn-test/

When you click on the right on HOOFD

Then click on MIGRAINE

I’d like to open the page about Migraine on the left, and keep the level of HOOFD expanded in the right menu.

How can I do this?

The page I need help with: [log in to see the link]