List View in UMG 4.20

How do I set up a multi selection with the new List View in UMG? I can just select one item at a time but I see there is a mulit selection mode and I don’t know how to get it to select more than one.

SetSelectedItem(item); will select one item.
SetItemSelection(item,true); will select multiple.
SetItemSelection(item,false); will unselect the item

Use an array of item to select/unselect current selected items.