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You can delete all submissions at once by clicking on Delete All submissions option on submission page of your form.
Also, there is a Time Frame filtering option available, so you can delete the filtered data.
When you try to delete all submissions you will need to enter password of your account.
Please take note: Delete submissions are permanently deleted and can no longer be restored.
I would suggest you to first download your files to your computer and then delete them.
Hope this will help. Let us know if you need further assistance.