A workflow submitter has the ability to Reset or Edit a workflow Process even after it has been submitted to reviewers if the "Reset/Edit Process" setting is enabled in the Admin console.
If you are a reviewer and have made an "Approve" or "Reject" decision by mistake, you can ask the workflow submitter to simply "Reprocess" the workflow and you can make a decision again.
How the workflow submitter can Reprocess (resubmit) a workflow:
① Click [Reprocess] button directly from the post view
Click [Reprocess] in the workflow pop-up screen
② Edit the workflow setup and make comments (optional)
③ Click [Start Process]