Colibri Main Menu: Submenu needs to unfold by clicking it, not by hovering

Dear All,

I have the problem that our university guidelines have changed insofar as they would like all digital objects such as menus to unfold only when clicked on, not when hovered on (in order to make it easier for people with certain disabilities).
For the main menu, we decided on the “Dropdown menu”, for which I could not find any option to only show the submenu when clicking on one of the first level components. It would allow for me to only show the first level components but that is not quite what I am looking for.

If there is something that I’ve missed or any Custom CSS that could help me out here, I would really appreciate it!

Thank You and have a wonderful day!

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