Hi there,

Thank you for reaching out to us.

Sorry about the problem that you're having, you can use this code instead to force the menu to be responsive:

@media only screen and (max-width: 768px){
    #slide-out-widget-area.fullscreen .inner .widget, #slide-out-widget-area.fullscreen-alt .inner .widget{
        padding: 0 30px !important;
    }
    #slide-out-widget-area.fullscreen .inner .widget.widget_nav_menu li a, #slide-out-widget-area.fullscreen .inner .off-canvas-menu-container li a, #slide-out-widget-area.fullscreen-alt .inner .widget.widget_nav_menu li a, #slide-out-widget-area.fullscreen-alt .inner .off-canvas-menu-container li a{
        font-size: 24px !important;    
        line-height: 30px !important;
    }
}

Hope this solves the problem.

Best regards.