Leave request workflow customizing

Hi,

in FIORI: Scenario Definition For Leave Request Approval is described how to define the leave request approval. Unfortunately this is the old way. Is there a guide how to use the standard workflow for leave request within the Fiori applications Leave Request and Approvel Leave Request?

My current configuration isn't using the workflow and therefore I am not able to use the representatives when the normal line manager is on vacation or somethlng like this.

How to configure the leave request workflow for the leave request (approval) apps?

Thanks a lot,

Vanessa