I ran into the same problem and almost panicked because I thought I lost all of my notes after running an update to my OS. Try going to View... and then select Show Folders. Somehow, Google decided to create a Google folder that was of course empty because I've never used it before, so I thought I lost all of my notes; when in reality, all I had to do was navigate to the folder view.
Hope this helps
nocturneisabundant
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