Dropdown - won't show the list

[integral-llc]

In case we have lots if items in the drop down list, once we make a selection, the items won't show anymore, only the current value is shown.

Can't tell exactly how many, but I'd say once they don't fit in the browser Height and the selection is made no items are shown.

If no selection is made, all items are shown.

Wondering, how would I add a scrollbar in the dropdown element, so user can scroll?