how to delete hidden folders from iCloud

Yes, but I am disable the iCloud drive on all my devices the hidden folders will still be present there, in the cloud.

Let' say I go and buy only new devices, as soon as I enable the iCloud drive these preference files will be recreated on my devices.

And there is no way to delete these hidden preference folders without enabling the iDrive on a Macbook and enable seeing hidden files, but once you enable this a local copy will be made on your drive. And when deleting these hidden folders from Finder they will be recreated instantly from the local copy.

Do you get my point?

It seems other people had the same problem:

http://noodlemac.com/2017/10/icloud-drive-has-a-dirty-hidden-mess/

One can see that it is the bird daemon which handles this synchronization. There is an utility called brctl but you cannot stop this daemon, at least temporary so that one can clean the orphaned folders

Unfortunately I don't like anything related to Microsoft or Google, also I don't trust them from a security/privacy point of view. Yes, iCloud drive has some issue. There is a command line utility which provides greater control of what's happening, called "brctl", but for the moment it lacks the functionality to delete orphaned hidden folders. I just hope some day Apple will improve this.

Just to inform other is someone finds this post later. Due to a recent change in my cloud account done by Apple now everything works correctly. Third party app folders are no longer hidden and can be deleted.

I doesn't work, it is recreated in an instant

No, because you cannot see hidden files/folders in the web interface.

Thanks but I already did that. There are not leftover from my SketchBook installation if I disable the iCloud Drive. As soon as I enable it the files are recreated.