Control Key (on windows)

bolejj
I use the Control key when I'm on a document in the middle panel and then what collection the item is in is then shown in yellow in the left panel.This is a great feature.I'd like to report that it doesn't always work however and I wondering if it is known what conditions make this occur?In this particular case the item in the center panel is a PDF in a known collection but I do not see the yellow highlight when I press the Control key.
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