WARNING: If you delete the iCloud backup for your current iOS or iPadOS device, iCloud stops automatically backing up the device.
Turn off Siri and remove Siri-related data: Select Siri on the left, then click Disable and Delete.
Click Done.
You can permanently remove all documents and data for an app, remove documents individually, and also recover files you deleted from iCloud Drive in the last 30 days. You can save copies of documents before removing them from iCloud.