Pressing Ctrl key doesn't show collections

I have search in the support, and it says,
“To see all the collections an item is in, select the item and then hold down the Option (Mac), Control (Windows), or Alt (Linux) key. Keep the key pressed. After a brief delay, the collections containing the item will be highlighted.”
However, I selected the item and press the "ctrl", it didn't work.
So where can I start to solve this problem?thanks a lot.
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