I reread your latest post and from what I understand is:
dropdown1 is populated from a dataset (meeting times)
is dropdown2 also populated with the same items as dropdown1?
If both dropdowns contain the same items, then to sync dropdown2, to match that of dropdown 1 then you could use the change event on dropdown1 to update the current index of dropdown2. This of course will only work if both dropdown lists are the same, and in the same order.
eg:
export function dropdown1_change(event) {
// set dropdown2 to match dropdown1
if ($w("#dropdown1").selectedIndex !== undefined) {
$w("#dropdown2").selectedIndex = $w("#dropdown1").selectedIndex;
}
}