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According to PTC help:
https://support.ptc.com/help/wnc/r12.0.0.0/en/index.html#page/Windchill_Help_Center/WCCG_UICust_PresentInfoUI_WCClientArchTree.html
Your expansion of the tree will be sticky within a session and will return to the default between sessions.
Does anyone know how to change what the default is?