The Notes client never completely collapses a Notes view that displays a document-response hierarchy. Even if you enable the If the Collapse all when database is first opened and Go to top row properties, Notes will collapse everything else in the view *** EXCEPT *** the thread containing the last response document you selected (or highlighted) in the view. UGH!
This behavior is documented in technote 1089903:
Whether the view is collapsed entirely on open is dependent on which document was highlighted when the view was closed. If a Main document or highest level document in a hierarchy is highlighted when the database is closed, then all categories will be collapsed when the view is opened. If a response or child document is highlighted when the view is closed then that discussion thread will be expanded when the view is opened, but all other discussion threads in the view will be collapsed. A discussion thread is a collection of documents that all have the same Main Document ancestor, ultimately.
Sure, you can add the following code to each view's Postopen event:
but this is a hack if there ever was one.
The Collapse all when database is first opened view property should be fixed so that a Notes view designed to open as collapsed will be completely collapsed, regardless of whether you had a response document selected or not.