@deadman36g
You can add a custom column (Preferences > Add your own columns > Add custom column) to show the GoodreadsID connected with this book with the following settings (s. attachment):
Name and Heading: whatever you like
Column type: Column build from other columns
Template: {identifiers:select(goodreads)}
Sort/Search by: Text
If you shelf is synced, a book which is not linked to Goodreads will have no ID in this column.
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