Removing Primary Menu

Hello,

I’m looking for help with removing the primary menu from my site. I have a top menu I want to keep, and previously I went into the Appearance – Customize section and removed the primary menu and it was exactly what I wanted. In the settings currently the primary menu has been removed. However, sort of out of nowhere one is now showing up on the site as “Menu” (see link here: https://sites.northwestern.edu/evostudy/). I must have changed the settings somehow but I don’t understand how…does anyone know how to remove it from the entire site using CSS code? I played around a bit but couldn’t come up with the answer.

Thank you!

The page I need help with: [log in to see the link]