[Plugin: Multi-Column Taxonomy List] Implementing the plugin w/ a Dropdown Menu

I recently installed this plugin onto a wordpress installation and am wondering if it is possible to implement it with a css dropdown menu I am using. I am assuming that I should be able to do it by customizing the css for both the menu and the plugin, but I was hoping to get a little guidance in that process, while helping others that may have a similar question.

Here is the test site I have running the drop down menu, that I am hoping to add multi column functionality to:
https://mrsearer.com/sandwiches

https://www.ads-software.com/extend/plugins/multi-column-taxonomy-list/