Permanently remove deleted files on iCloud.com
On iCloud.com, you can immediately and permanently remove files you deleted from iCloud Drive, iWork apps, or other apps within the last 30 days, whether you deleted them on iCloud.com or on your iPhone, iPad, iPod touch, Mac, or Windows computer.
In iCloud Drive on iCloud.com, tap All Files at the top of the screen, then choose Recently Deleted from the menu.
If you see Recently Deleted instead of All Files at the top of the screen, you’re already in the Recently Deleted folder.
Do one of the following:
Delete some items: Tap Select, select the items you want to delete, then tap Delete at the bottom of the screen.
Delete all items: Tap Select, then tap Delete All at the bottom of the screen.
To go back to your other files, tap Recently Deleted at the top of the screen, then choose All Files from the menu.