Community Tip - Did you get called away in the middle of writing a post? Don't worry you can find your unfinished post later in the Drafts section of your profile page.
According to PTC help:https://support.ptc.com/help/wnc/r18.104.22.168/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?