Jasper Template - forcing navigation links to be listed vertically

Site URL: https://www.christophercalmeyer.com/

Scoured the forums but couldn't find any answers to this, my apologies if it has been posted already though!

Is there a way to force the navigation links in the Jasper template to be listed vertically at all times and not just when the browser window has hit a certain size threshold? Attached is an example of how I'd like the navigation bar to look.

Thank you!