Answer:
Project Manager is divided into several areas. On the left is the project navigator. The upper middle area displays either the models assigned to a project (tab "RFEM", "RSTAB", and so on), or an overview of the projects (tab "Projects").
When displaying the project overview, it is not possible to create a new RFEM or RSTAB model. To do this, switch to the "RFEM" or "RSTAB" tab. The video shows a short instruction.