This sounds like just what I need, but I can't get it to work on my computer (windows 7), so according to the zotero docs pasted below I should just press the "Control" key). But nothing happens.
Zotero documentation:-
To see all the collections an item is in, select the item and then hold down the “Option” key (Mac OS X), “Control” key (Windows), or “Alt” key (Linux). This will highlight all collections that contain the selected item.
There is a known display bug that sometimes the highlights don't show up in Windows immediately on pressing Ctrl. Hold Ctrl and start to drag an item to see the yellow highlights on collections.
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Zotero documentation:-
To see all the collections an item is in, select the item and then hold down the “Option” key (Mac OS X), “Control” key (Windows), or “Alt” key (Linux). This will highlight all collections that contain the selected item.
Any help appreciated
Thanks