Besides controlling sharing at the individual Document or File level, you can also set sharing at the Folder level. Whenever you set Folder sharing, all Documents in that Folder (and any subsequently newly created Documents) are automatically given the Folder’s Share Settings.

Note: before setting sharing, you might want to set up a Share Group for your Friends.

To set Folder-level sharing

Set Sharing on Folder Sets

Learn more about Folders and Folder Sets.