How to specify the maximum distance between several nodes (plaintext)

Sorry for my poor english...
I generate a tree with 2 levels of nodes. By clicking on a node, I re-generate the tree with a third level but only expanding the branch of that node. And so on...
The last level is composed of more than 15 nodes. So I would like to present them as a list (plaintext) without a large separation as drawn by default. I precise that I  I need to link each node to a URL.
How can I do that ? Thanks in advance for your reply !
Best regards
PS: I use for now dot

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