Code Not Working in mobile

$w.onReady (function () {
$w(“#headerSwitchPoint”).onViewportLeave(() => {
$w(“#smallheader”).show();
$w(“#largeheader1”).hide();
$w(“#largeheader2”).hide();
})
$w(“#headerSwitchPoint”).onViewportEnter(() => {
$w(“#largeheader1”).show();
$w(“#largeheader2”).show();
$w(“#smallheader”).hide();
})
});

I Want to run code Only Window / Desktop Mode, I Want “Not Run” Code in Mobile View.