How do I prevent the filter panel from filtering itself after clicking?

I have a project with a bunch of products divided into sections and categories.
Currently I am using the filter panel to list all the sections and categories in a tree-like view. When you click on a specific section or category, the filter panel correctly displays the products in that section or category.
My problem is this: After clicking, the filter panel filters itself and hides the rest of the sections and categories that do not fall under the item you clicked on.
How do I prevent the filter panel from doing this - in other words, keep it static like a tree-type menu, where you can still see the entire list after clicking on something?