This is a addon added with v7.1. This feature controls the display of featured listings within the top of the category browsing page. This new feature allows you to set a number of featured listings to display at any one time as well as allow the featured to scroll to display many more than can display at an one time.
highlights of the Featured Gallery Addon:
To start using this feature you'll need to enable and install the Core Display addon in the following admin tool:
ADDONS > MANAGE ADDONS
Then you turn on and control all but what fields display in this feature here:
ADDONS > CORE DISPLAY > FEATURED GALLERY SETTINGS
You will see a screen like the one below where you can set site wide setting for this feature:
Within that screenshot you'll see these controls that will affect that feature site wide:
To control the fields that display in this feature site wide look to the following:
LISTING SETUP > FIELDS TO USE > "DISPLAY IN ADDONS" TAB
You will see settings like the ones in the following screenshot:
That just shows the standard field configuration in that screenshot but you'll see the same configuration for all fields that can display within this feature.
And you can control field display on a category by category basis here within the admin tool:
CATEGORIES > CATEGORY SETUP > [EDIT] (NEXT TO A CATEGORY TO CONTROL FOR) > FIELDS > "DISPLAY IN ADDONS" TAB
which looks the same as the previous screenshot.