Dear maintainer Currently it does not seem possible to move an existing spreadsheet into a folder, only to create a folder and then create a spreadsheet within that folder. That's quite annoying, because sometimes structure only emerges halfway through working on the data. Could you please add this feature?
this is a very valid request. This feature is already on our TODO-list. We're finalizing the next release 2.6 right now. After this we'll start working on 2.7 and we'll add this feature (drag&drop of objects in the project explorer) to 2.7.
This is implemented now and will be available in the next release 2.7. In case you have the chance to compile the our source code, you can give it now a try. Thanks.