I am using Material-table and especially Tree-data: https://material-table.com/#/docs/features/tree-data.
As I am implementing the exact example I cannot receive my arrow icon. It is like:
Could you tell me what I should pass into icons'object so it could render the right arrow + the down arrow when it is opened? Previous I had the same problem with sorting arrow but later I found that I should pass SortArrow to icons property of MaterialTable component.

