This file is part of Utility Pro version 1.3.0 and higher: js/responsive-menu-args.js. I commented out the nav-footer portion so my footer menu remained in-line on my website.

responsive-menu-args-comment-nav-footer.js

/* global jQuery:false, utilityMenuPrimaryL10n:false, utilityMenuFooterL10n:false */

jQuery( function( $ ) {
    'use strict';

    $( '.nav-primary' ).gamajoResponsiveAccessibleMenu(
        {
            l10n: utilityMenuPrimaryL10n
        }
    );

    // $( '.nav-footer' ).gamajoResponsiveAccessibleMenu(
    //     {
    //         l10n: utilityMenuFooterL10n,
    //         navSelector: '.nav-footer',
    //         mainMenuButtonClass: 'footer-menu-toggle'
    //     }
    // );
} );