Customizing Sidebar in Fashe Theme

Hi, I’m trying to customize my sidebar in the Fashe theme on my Shopify store to look more like it does in the demo. Right now it only shows the categories in chronological order, but I want it to show the main category in bold and have the subcategories below it.

Also, how do I make the sidebar different in each collection page? In my main category collection pages, i want the sidebar to just show all the main categories and in my sub category collection pages, I want the sidebar to show everything. Thanks