If you’re the owner of a document that’s shared with others, or if the owner gave you permission to add more people, you can view or change the 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.
Click the Collaboration button 
in the toolbar.
The participant list appears. People in the participant list 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; click Share Options to see details.
If you’re the owner of a shared document, or if the owner gave you permission to invite others, you can change the access at any time, but everyone collaborating 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 access the document, and they don’t need to sign in to iCloud.com to do so.
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 and who sign in to their Apple Account can access the document.
Click the Collaboration button 
in the toolbar.
Click Share Options, then click the “Who can access” pop-up menu and choose an option.
If you’re the owner of a shared document with access set to “Only people you invite,” or if the owner gave you permission to add people, you can quickly change everyone’s permission to be the same.
Click the Collaboration button in the toolbar.
Click Share Options, then click the Permission pop-up menu and choose an option.
To verify someone’s permission, move the pointer over their name, then click the three dots that appear 
.
Anyone who has the document open when you change this setting 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,” or if the owner gave you permission to add people, you can change the permission for an individual without affecting the permission of others. You can also remove an individual’s access to the document.
Note: Participants with permission to add people to the document can’t change the permission or access of the owner.
Click the Collaboration button in the toolbar.
Move the pointer over the person’s name, click the three dots that appear , then click an option.
Note: If you shared this document with only one other person, you need to click Share Options to make your changes.
Anyone who has the document open sees an alert and the new settings take effect when they dismiss the alert.
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.