If your ReadyTheme did not come with the default Display List Filtering extension pre-installed, you can add it to your site by performing the following steps.
- Create a new build subdirectory as
build/extensions/display-list-filtering/
- Add _display-list-filtering.scss to the directory.
- Update your
build/extensions/extensions.scss
file to include@import "display-list-filtering/display-list-filtering";