This option offers you to copy all the recovered files form the right pane of the window to the desired location. To use Recover All option follow these steps:
Click Recovery Menu > Recover All or click Recover All button from the toolbar.
OR
Right click the button, then popup menu appears as following:
Choose Recover All from the popup menu as shown above, then following screen appears:
Choose the desired or safe location to copy all the files from the right pane.