All Siblings on Same Level

I am unable to figure out how to force the chart to show all the siblings on the same level, as in many of the demos.

<img width="505" alt="Image" src="https://github.com/user-attachments/assets/fcd0d108-bb01-4607-a080-24af33ab62be" />

I want it to be like this:

<img width="706" alt="Image" src="https://github.com/user-attachments/assets/341093dc-d154-49b6-ad38-b231758bdd32" />