The shareable link option is a good way to share documents with others without the need for them to have a Google account. We can easily stop sharing a link to a document with others just as easily as we shared the link. Before turning off sharing for a link, you should either replace it with another or inform those with access to the link that the link will no longer be available. If not, you’re likely to get lots of feedback about broken links.
In the open document, click the share button.
Click on the triangle next to the permission and select “Off-only specific people can access”. Click the done button to close the pane.
We can also turn off permission from within Drive. Right click on a document and select share from the contextual menu.