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, click Recently Deleted in the lower right-hand corner of the window.
Click Delete All, or select each file you want to delete, then click Delete.
Remove files deleted from other apps
In Settings on iCloud.com, click Restore Files (in the Advanced section).
Select each file you want to permanently remove, or select Select All.