How do I clear incomplete payments in my jotform paypal that I did when testing in sandbox

I understand that your JotForm is having incomplete payments and you want to clear them. You may delete the incomplete payment submission from the pending submissions.

https://www.jotform.com/help/564-how-to-view-incomplete-payments-of-your-payment-forms/

You may be also interested in taking a look at PayPal Incomplete Payment FAQs for more information on this.

https://www.jotform.com/help/272-Paypal-Incomplete-Payments-FAQ

Hope this information helps!