Explorer allows you to browse and view the content of a selected folder. For example, that can be your output movie folder.
To switch to the Explorer mode, click "Files" on the modes pane on the top of the program's window or select "Files" on the popup list at the top of the program's window.
Selecting view mode
To select the output folder view mode, simply click on the corresponding view button between the explorer's workspace and the "Output path" field. The available view modes are standard to the modern operating systems and include: Large icons, Small icons, List, Details, Thumbnails.