undo massive import from covidence

Was trying to download selected refs from covidence in zotero format but instead got ALL docs from covidence and went into the wrong folder in zotero.
In 2016 thread, they allude to creating a column based on import date but that no longer seems possible. I can see the "date added" as part of lots of info in rightmost column but hate to go through hundreds of papers one by one to remove. Is there a way to undo massive import by date in 2026?
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