I too noticed this and wasn't sure if it was a feature, or a bug.
However, I much preferred when it would NOT open a collection by
default. When switching layouts, it still opens the last collection you
had open, even if it's associated with a different layout. PLEASE switch
it back to the way it was, where you had to "Import Collection" to view.
Often, I prefer to set up my cards and rules without the collection
visible, Makes it much faster to work that way.Thanks,Tommy