If you’re the owner, you can view or change a shared document’s access and permission settings at any time.
If a document’s access is set to “Only people you invite,” you can also set a different permission for each individual.
Do one of the following:
If the document is open: Tap 
.
If the document is closed: Tap the green corner of the shared document in the document manager.
The participant list appears. Participants can edit the document unless you see View Only below their name.
If you’re the owner, a summary of the access and permission settings appears below Share Options; tap Share Options to see the details.
To view permission for an individual, tap a name.
If you’re the owner of the document, you can change its access at any time, but anyone you shared the link with is affected. Here are the results of changing the setting:
From “Only people you invite” to “Anyone with the link”: The people you originally invited can still open the document, along with anyone else who has the link. They don’t need to sign in to iCloud with the email address or phone number you used to send the link.
From “Anyone with the link” to “Only people you invite”: The original link no longer works for anyone. Only people who receive an invitation from you can open the document, and they must sign in to iCloud with an Apple ID.
Do one of the following:
If the document is open: Tap .
If the document is closed: Tap the green corner of the shared document in the document manager.
Tap Share Options, then tap the access setting you want.
Anyone who has the document open when you change the setting sees an alert, and if your change causes the person to lose access to the document, it closes immediately. Otherwise, the new setting takes effect when they dismiss the alert.
If you’re the owner of a shared document with access set to “Only people you invite,” you can quickly change everyone's permission.
Do one of the following:
If the document is open: Tap .
If the document is closed: Tap the green corner of the shared document in the document manager.
Tap Share Options, then tap the permission option you want to set.
Anyone who has the document open when you change the permission sees an alert. New settings take effect when they dismiss the alert.
If you’re the owner of a shared document with access set to “Only people you invite,” you can change the permission for an individual without affecting the permission of others. You can also remove their access to the document.
Do one of the following:
If the document is open: Tap .
If the document is closed: Tap the green corner of the shared document in the document manager.
Tap the person’s name, then tap an option.
Anyone who has the document open when you change their permission sees an alert. The new setting takes effect when the alert is dismissed.
If you choose Remove Access, the person is asked to close the document, and it’s removed from their iCloud Drive. Any edits they made to the document remain.