A Withdrawn application will be in the "Finalised" Status. To find a withdrawn application, you need to have unticked all other Status so that only Finalised is ticked:
You can then create a copy of this withdrawn application by clicking the 3 dots on the far right of the record line:
This will present a set of options. Click Copy Application:
You will have a window popup where you can create a Title for this new application, and choose to also copy the supporting documents (or not) from the original withdrawn application:
If you click Copy, the new application will be created and you will be able to finalise and re-submit.