After submitting a dispute request on Paypal,If you would like to cancel it, you could refer the following procedure.
Step 1: First of all, you have to find out the dispute request you had reported in Resolution Center. The easiest and fastest manner to find it is searching the transaction ID as the following image:
And your dispute request will be showed as a result:
Step 2: You can click “view” to open this dispute request with more details. You can see the line “Mark this problem as resolved" at the bottom of this page.
Step 3: Clicking this line If you would like to cancel this dispute, after that there is a notification requiring you confirm your request again
Finally, clicking confirm is final step so that you can cancel the dispute request you had reported.