Secondary Menu showing up unstyled

If you are seeing the secondary menu but it is unstyled (it looks like a list of bullet points), then your theme is using CSS that doesn’t match the output of this plugin. You can either update the CSS of your theme, or modify the output of the plugin to match.

Most themes style it using #subnav li a.

For instance, the Agency theme style the menu using .menu-secondary li a. By adding this code to your functions.php file (exclude the <?php at the top) you will update the output of this plugin to match that structure: https://gist.github.com/billerickson/5629245

https://www.ads-software.com/extend/plugins/genesis-subpages-as-secondary-menu/