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Platform: Win XP
When you have several folded items in the overview window and unfold one of them, all other items unfold as well. It is therefore not possible to unfold a single item if others are folded.
Yes, the folding behavior of the overview area can be a bit erratic. I marked it as a feature request:
Thanks for pointing this one out!
There's much bigger issues in the world, I know. But I first have to take care of the world I know.