All items disappeared, but still can see all collections

Don't know why suddenly all my saved items disappeared in every single collection folder. I still can see all the collections, but when I clicked on each collection folder, there is nothing inside. I restarted firefox (54.0) and PC (Win10), but the problem cannot be solved. I checked the lib in the Data Directory, seems everything is just fine. I synced the lib to the server, and checked the online lib, it seems everything is fine.
I wonder if this may be caused by just accidentally pressing a shortcut, that will hide all the saved items?
Thank you for your help.
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