how to delete hidden folders from iCloud
MacBook Pro TouchBar and Touch ID, macOS High Sierra (10.13)
Is not enough my friend. You don't know if a daemon has a different name which do not contains "SketchBook".
On the Mac where this software has never been installed logout from iCloud (from System Preferences), then disable the iCloud on the "guilty" Mac, execute http://etrecheck.com/ if you want to see of you have missing references, daemons or other startup items (even orphaned), then enable iCloud, enable the cloud disk, enable the File System monitoring and delete the folder. Then stop the monitoring after you see that the folder has been recreated.
Be also sure before to start, that no other device are logged to your iCloud or have this software installed.
how to delete hidden folders from iCloud