Hidden Elements on Mobile

Sorry ehm… apparently I don’t know what I should put inside the bracket. Because when I put the animation code in the wix-window code you give, like this:

 import wixWindow from 'wix-window';
 
 let formFactor = wixWindow.formFactor; // can be either "Mobile" or "Desktop"
 if (formFactor === "Mobile")
 {
 //do some mobile only code }
 else
 {
 export function Header_onViewportLeave(event){
 $w("#LoveIcon").show("FadeIn");
 //Add your code for this event here:
 }
 //do some desktop only code
 } 

There is an error “import and export may only appear at the top level” #OMG