How do I prevent the Widget from building the list of selected items?

[nickolasdeluca]

I'm still styling the Widget, but I'd like to remove the list and instead simply show how many items are selected.

This is how I tried to implement what I want:

selectedItemBuilder: (_) => Text(
  "${controller.selectedItems.length} items selected",
  style: TextStyle(fontSize: 12),
),

This is a screenshot of the current state when multiple items are selected:

Is it possible to achieve my goal or do I need to modify the base component to implement this feature?