Unlike Expenses, Timesheets can not be recalled or reassigned to a different Approver. If a Timesheet should go to a different approver, the approval workflow has to be modified. After it's modified, the Timesheet has to be reset to draft and re-submitted.
If you as a Nexonia User need to adjust a Timesheet, please reach out to an Administrator so that they can reset it to draft. There isn't an option to recall the Timesheet on your own without Administrator intervention.
If you are looking for instructions on reassigning expense approvals, you will find that in this article.