Stop or change sharing
Files and folders can be shared by sending someone a sharing link, or by giving them direct access to the file or folder. (People may also have access to a file or folder if they've been given access to the site itself.)
If you are the file owner, you can stop sharing the file or folder.
If someone has been given direct access, or has access through a specific people link, you can also change the sharing permissions between view and edit.
Here are the steps:
Select the file or folder you want to stop sharing.
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Select Information 
in the upper-right corner to open the Details pane.
Note: (The Information icon is just below your profile picture. If you don't see it, make sure you only have one file or folder selected - it won't display if you have multiple items selected.)
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On the Details pane, under the Has Access header, you'll see the People icon, the Links icon, and/or the Email icon. These options vary depending on how you have shared the file or folder. Select Manage access and:
To stop sharing the file entirely, click Stop sharing.
To delete a sharing link, click the ... next to the link, then click the X next to the link to remove it. (You'll get a prompt asking you if you're sure you want to delete the link - if so, click Delete link.)
To stop sharing with specific people, expand the list under a specific people link and click the X to remove someone.
To change permissions or stop sharing with someone who has direct access, under Direct Access, click the dropdown next to the person's name and choose the option that you want.