My b2evolution Version: 2.x

Just want to ask if there is any way to make the categories cleaner. Like making every parent category bigger. Hhhmm. For example this site.
http://www.cyber12.com/
In there categories the parent category like the media download and feature anime is different from the subcategories. I want to do it too.

Is it possible to hide the subcategories. For example in my blog.
http://animedepot.site50.net/
Look at the category my parent root is anime. I want to hide the subcategories of it in the parent root like a spoiler type. It will be only shows up whenever someone click on the parent root.

Tnx