ReactJS Support & Suggestions needed for 'React multi-select Searchable hierarchy tree dropdown'

Hi Devs,
Hope everyone is doing great, As I mentioned in the title of this thread, Currently, I am looking for a customizable free multi-select searchable hierarchy expansion tree dropdown, I have found one component called "react-dropdown-tree-select", but I am not getting how to customize it with my own CSS stylings and theme like how to display only first selected item inside the dropdown instead of displaying all the selected items, where it keep on growing when we keep on select the items inside.

**So Can anyone Pls suggest how to customize this "react-dropdown-tree-select" dropdown?

Or

If you have any other component suggestions Please let me know.**.

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