How to bulk-reattach whiteboard entities relation arrows (automatically or semi-automatically)

In this case I want to display a parent ‘Chain’ entity and its child ‘ChainStep’ entities in the follwing way, but it appears only possible repositioning and reattaching arrows manually:

What I tried

First align vertically:

Then drag it in position but the arrows are attached in the wrong places.
There appears no way to automatically re-attach it in a visually logical way?

Oh, and another question here:

Bulk adjust relationship arrow length

When automatic positioning is used, the arrows are veerrrry long. Is there a way to set the default length for entity relationship arrows?

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