I am following Creating a Complete Order Entry System. At creating windows data entry components I can use the wizard to construct the forms and it works perfectly. When I click DDO explorer nothing happens, so I can not add components to the form.

I tried deleting the workspace, deleting the related folders and tried following the steps and encountered the same problem.

I am using DataFlex Studio 2021 v.20.0.7 Studio build 20.0.6.140. I use the Embedded tables.
Windows 10 x64

How to activate DDO explored.

Thanks,
Charles