How to apply multiple 'let fadeoptions' to different elements

What you can do is something like this for each of the methods

let fadeOptions={
    "duration":400,
     "delay":0
};
$w("#anchorx").onViewportLeave((event)=>{
fadeOptions.duration = 300
$w('#wildlifelogomain').show("fade",fadeOptions);

});

But do note that this will change the duration of the faceOptions, also for the other methods

Another way to do it would be to make different options for the different durations, wich is not a bad idea if you only have a few different durations, and no other special effects.