Collapse Hierarchy without Container?

[sivaswami]

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Describe the bug
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In the above diagram, I want to collapse only the items below Request. But not the RequestSpec. Is there any way I can achieve this without "Container". I want to collapse only downwards not sidewards.
When you specify collapsible, it is collapsing both downwards and sidewards. Can I constraint the collapsible option ?

To Reproduce
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Create 2 tree structures and join them with a edge. make both tree structures collapsible. if you collapse one tree structure, the
other one also collapses.

Expected behavior
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Only one tree structure should collapse.

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draw.io version (In the Help->About menu of the draw.io editor):

• draw.io version x.y.z

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Additional context
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