Permanently remove deleted files on iCloud.com
On iCloud.com, you can immediately and permanently remove files you have deleted from iCloud Drive or other apps within the last 30 days.
Remove files deleted from iCloud Drive
In iCloud Drive on iCloud.com, tap Recently Deleted at the bottom of the window.
Do one of the following:
Delete some items: tap Select, select the items you want to delete, then tap Delete.
Delete all items: tap Delete All.
Remove files deleted from other apps
In Settings on iCloud.com, tap Restore Files (in the Advanced section).
Select each file you want to permanently remove or choose Select All.