Go to Documents and locate the document you want to view. (Try switching between All, Recents, and Starred tabs.)

On the More Options menu, select View details and access.

Here, you can see a preview, enter a description and view the users who have access to the document.
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You can also search for users, and check the permissions for each user. (Users can be given permission to view, or view and download.)
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You can grant view or download permissions for each user using the icons (to apply to all users, use the icons next to the Search box):
- Select the eye icon to allow or restrict view access

- Select the download icon to allow or restrict users from downloading

Select Save to ensure these changes are kept. You can then let users know you've changed their access by clicking Notify on the ensuing modal. If you don't need to inform them, select Don't notify.

The More Options menu also allows you to rename, move, star, download, copy the link to, and delete the document.