In DT2 I could move Smart Groups into a database and into folders. I hope this feature will not be removed from DT3 as it still supports such smart groups created in DT2.
You can still create smart groups in databases, see e.g. Data > New menu (but neither version 2 nor 3 support moving of global smart groups into databases)
Okay, that’s true I always moved smart groups from a database to the global groups before, what is possible in both versions.
The problem in DT3 is, that I now can open a database structure inside the sidebar. There I tried to create a smart group inside a folder. That does not work as expected. So that’s the reason why I want to move the global smart group into a folder. I never needed that before. 
You can create the smart group e.g. via the main view’s contextual menu.
I know that but the new feature let me think it’s also possible there.
There’s already an item for global smart groups in the sidebar’s contextual menu, two almost identical menu items for both cases or a menu item that sometimes creates local, sometimes global smart groups would IMHO only cause confusion.
