The first tab is the project settings panel. It will be possible to change the name (but not the autogenerated shortname), the description, and archive the project.
The Preview button will render the description markdown.
The second tab contains the list of boards, displayed as following
To edit the board, click to toggle the edit panel. The panel works in the same way as the project settings, but and Cancel close the edit form.
The shortcut archives the board, and will restore it. An archived board has its colors faded.