I have two Projects in one Organization (like in the attached image below).

I would like to see the items from both Projects in the same Azure DevOps Board (dashboard).

Azure DevOps Boards (dashboards) show just the items from the selected Project.

How can I add items (User Stories) from both Projects to the same Azure DevOps Board?

(There is pretty good documentation on https://learn.microsoft.com/en-us/azure/devops/boards/?view=azure-devops but I did not find the answer)