The options on the Layout tab allow you to setup how the list will show, if in fact you want a list to show. You can also select the template to be used for the InfoWindow on the map.
Layout tab settings
Check this option if you want to show the list of posts. If this is unchecked, only the map will show, with the markers.
Template used for building the list. This allows you to show the posts in a different layout.
Number of words to be shown in the template. This allows you to control how much text is shown. You may want more text to be shown for one template as opposed to another.
Background color of the highlighted post when selected on the map. If you click the marker on the map or the map button in the list, the background color of the list item will be highlighted with this color.
Template used for building the infowindow on the map (when a marker is clicked).
Infowindow Content Length
Number of words to be shown in the infowindow template. This allows you to control how much text is shown.