Change default font

I tried to look this up in this forum, but all I could find was an answer that said use the Customizer and go to:

Customizer -> Header

… then go to Style and expand Typography.

However, I there is no “Header” in Customizer for Neve, at least not in our non-pro version, and no settings for Typography that I can find.

I am trying to change it in our style.css file for our child theme, but it’s not working. Using dev tools in the browser, there is this set (it includes other settings within “:root” but they are not relevant):

:root {
--nv-fallback-ff: Arial, Helvetica, sans-serif;
}

When I uncheck that, the font we have set in our style settings works. But I can’t seem to override this default setting. I’ve tried:

:root {
--nv-fallback-ff: unset !important;
}

… among other things, but nothing works. How can we override the default font settings in Neve?

Thank you.