[NSFW] Mobile Menu Font setting

Hello @admin3571,

The only options that you can change for responsive sizes are font size and letter spacing: https://i.postimg.cc/d3KQXyhv/image.png. So, unfortunately, it is not possible to change the font face in the customizer.

However, to achieve it, you can do customization with CSS. You can learn how to use Chrome Developer Tools or Firefox Developer Tools to help you see and test changes to your CSS:
https://developers.google.com/web/tools/chrome-devtools/
https://developer.mozilla.org/en-US/docs/Tools
CSS Tutorial: https://www.w3schools.com/css/

You can use “media query” for responsive mobile and tablet
https://www.w3schools.com/cssref/css3_pr_mediaquery.asp

Summary: put your CSS on custom screen size:

@media only screen and (max-width: 480px) {
    /* put you CSS here*/
}

Or use between sizes:

@media (max-width: 960px) and (min-width: 481px){
    /* put you CSS here */
}

Best Regards