How to hide the scroll thumb?

**Is it possible to hide the scroll thumb if the list of items doesn't take an entire page?**
I tried creating a custom scroll indicator, and setting it to an empty container if the list of items is less than 20 items for example. But if I do that I can't show the `labelTextBuilder` or use `DraggableScrollbar.arrows`

I would also like to know how to hide the scroll indicator if the user is using pull-to-refresh.

`(Current simple solution: list.length > 8 ? DraggableScrollbar(list) : list)`

Other question: **How can I reset the scroll indicator position?**