I have two databases that I want to show as 1st level, but they share a third database that I want to show as the 2nd level on both. Why is this not allowed? Is there anyway around this?
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It’s not currently possible, and I know of no clever workarounds.
It’s hard 
I haven’t asked the devs, but my guess is that the view is formed by querying databases, with filters, to determine which entities should be shown, and then using clever front-end logic to decide how/where to show each entity (e.g. under which parent, in what order, etc.)
If a database is participating in the view at two different levels, these operations can’t be easily decoupled.
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