Access the Style Control settings from Admin → Extensions → Template Manager → rt_nebulae_j15 → Settings.
Simple configure the options, then save and Gantry will automatically load the modified preset to your site.
With Gantry, the ability to assign a certain style to an individual page has never been easier and/or more efficient. Just follow these simple steps:
Gantry Framework: Per Menu Item ControlsJoomla! makes it easy to launch a Web site of any kind. Whether you want a brochure site or you are building a large online community, Joomla! allows you to deploy a new site in minutes and add extra functionality as you need it. The hundreds of available Extensions will help to expand your site and allow you to deliver new services that extend your reach into the Internet.