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You can remove the current integration and create a new one. If you re-integrate the form to Google Sheets again, it will create a new spreadsheet. However, the existing or the old submissions will still appear in the new spreadsheet. It is a normal behavior of the integration.
The solution is to delete all the submissions in the new spreadsheet and then save the changes. Now, when a new submission comes in, it will be on the new spreadsheet without the old submissions.
The old spreadsheet should still be in your Google Spreadsheets folder.
Hope that helps. Let us know if you need further assistance. Thank you.