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The given example illustrates a vertically oriented editor. It has been achieved by making subtle changes to nodes and connections, specifically:
The actual example is built using React.js, but around 75% of the listed changes are stack-agnostic. This means that to utilize them in Angular, Vue.js, or Svelte, you'll need to create a corresponding custom component. If you encounter any issues with it, don't hesitate to reach out via GitHub Issues in the relevant repository.