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Reply to: Structure view: how to set the initial collapse level?April 23, 2015 at 9:58 pm
There is an API for this called SVCollapsedContainer (see the Programmers Guide for details).
However, because this is DITA that makes things a bit trickier since making modifications to the DITA customization's functionality is not really supported. In this case I don't see any potential for conflict with the normal DITA authoring scripts though.
The API doesn't work the same way as the built-in UI for the Structure View though. Calling the API collapses a particular element, so it would need to be called repeatedly on all the different nodes you want to collapse. I'll see if I can hack something together for you that does something similar.
I'm a bit curious this would be something people need for DITA though. How big are your topics?