Category Box - Show Subcategories

[bermuda]

The category box shows the top level categories. When you select a category, it does not expand to show the subcategories. It just shows them at the top of the page content.

Is there a setting or Add On that will show the subcategories of the selected top level category in the box itself?

[bermuda]

I am an idiot. I looked and looked and completely mised there was a setting there!

Maximum Level of Nesting