Expand and Collapse Product Categories

Greetings!

I do not see an option to enable "expand and collapse" for the product categories and I think we should add this feature to FrameMarket!

Check this website out, http://www.fatwallet.com and look at the left column under Categories. Play around with it and you will know what I am talking about.

And also how do I omit the "green arrow" pointing at each category?

Thanks,

Brad