Preview

The settings at the top of this tab refer to the Preview Window opened when you select a file and press Space:

Choosing the Previewer you wish to use
Choosing whether or not to autoplay video/audo
Selecting the map to use when you press a photo location button

Metadata: This is the selection of files for which a text excerpt will be shown in the metadata line (the second line) in the Thumbs+Details File view.
Thumbnails: A list of file extensions for which you do not want to show thumbnails.

Backlinks:
1. One Commander Version 3:Installing One Commander V3
2. Quick introductory guide:9. Other useful features
3. Full reference guide:Folder Pane
3. Full reference guide:Preview