Hello Koray,
you have to use the res to update the elements you want,
See the code below:
export function dropdown1_change(event, $w) {
$w("#dataset1").onReady(() => {
let test = $w('#dropdown1').value;
wixData.query('datasetName')
.eq('title', test)
.find()
.then((res)=> {
$w("#title").text= res.items[0].text;
});
});
}
Hope this help you.
Best,
Mustafa