Expand first element of repeater

I’ve got a repeater with 2 input elements. I want to achieve that the first element of the repater expands when the page is ready.
It’s that simple but I have tried several codes from other users but nothing helped me out.

It should look like:

$w.onReady(function () {
    firstElementOfRepeater.expand();
}

Is that all your code?
It won’t work like that!

There are a lot of examples about how to work with repeaters.

Take a look here…(similar issue)
Getting the displayed value of a button in a repeater | Velo by Wix