Please refer to the top hero section on this page for the example of Revolution Slider.

It's initialization code in this javascript file is:

function dz_rev_slider_5(){
    if(dzQuery("#rev_slider_11_1").revolution == undefined){
        revslider_showDoubleJqueryError("#rev_slider_11_1");
    }else{
        dzrevapi = dzQuery("#rev_slider_11_1").show().revolution({
            sliderType:"standard",
            sliderLayout:"fullscreen",
            dottedOverlay:"none",
            delay:9000,
            navigation: {
                onHoverStop:"off",
            },
            responsiveLevels:[1240,1240,778,778],
            visibilityLevels:[1240,1240,778,778],
            gridwidth:[1640,1640,778,778],
            gridheight:[768,768,960,960],
            lazyType:"none",
            parallax: {
                type:"mouse",
                origo:"enterpoint",
                speed:400,
              speedbg:0,
              speedls:0,
                levels:[5,10,15,20,25,30,35,40,45,46,47,48,49,50,51,55],
            },
            shadow:0,
            spinner:"spinner0",
            stopLoop:"off",
            stopAfterLoops:-1,
            stopAtSlide:-1,
            shuffle:"off",
            autoHeight:"off",
            fullScreenOffsetContainer: "",
            disableProgressBar:"on",
            hideThumbsOnMobile:"off",
            hideSliderAtLimit:0,
            hideCaptionAtLimit:0,
            hideAllCaptionAtLilmit:0,
            debugMode:false,
            fallbacks: {
                simplifyAll:"off",
                nextSlideOnWindowFocus:"off",
                disableFocusListener:false,
            }
        });
    }
}

I need to reduce the height of the slider by 30% for mobile devices. And by following this answer, I tried changing the value of gridheight from [768,768,960,960] to [768,768,672,672]. I also tried changing the value of autoHeight from "off" to "on". However, those tries do not work.