No existing Projects showing

According to the manual I created a project to share this project and its documents to other users.

I can see the project in the shared details of the specific folder where the project has been created. But the project is not visible elsewhere. Even in ‘Type to search for existing projects’ there is no result. There are no projects?! And so I cannot share the project.

Any help would be helpful!

Nextcloud Version: 17.0.3