Reply To: Filter menu re-order

I want it to display only the child categories for each of my primary categories. However, when a user clicks on my category, all my other secondary/child categories disappear. I would like it so that when a user enters one of my primary categories, all the child categories are displayed and remain displayed. However, I do not wish for all my primary categories to be displayed as well. How can I achieve this? Here is a screenshot for reference: https://prnt.sc/TZuDQb814bVY.