Showing Subcategories in the Category Widget

Ive added some parent categories and under them some subcategories. After that I added a Category Widget to my sidebar. It only shows the parent categories.

So if i click on a parent categorie it doesnt shows the subcategories. I only have the option to show all subcategories or showing the post count. Ive over 100 Categories 😐

I only want to open the subcategories of the parent category i clicked on