You can use that component. It's clientlibs are defined under ui.apps:
"As part of the starter project a dedicated client library for the Responsive Grid has been included in the ui.apps project. You can view the client library at /aem-guides-wknd-events/ui.apps/src/main/content/jcr_root/apps/wknd-events/clientlibs/responsive-grid. This client library has a category of wknd-events.grid and includes a single file named grid.less which includes the necessary CSS for the Layout Mode and the responsive grid to work. Next we will make sure that this CSS is loaded with the React app."
AEM ships with an edit mode called Layout mode which when enabled allows authors to re-size components and containers to optimize content on different device widths. This feature is baked into the SPA Editing capabilities. The only action needed is to integrate AEM's Responsive Grid CSS into our project.
As part of the starter project a dedicated client library for the Responsive Grid has been included in the ui.apps project. You can view the client library at /aem-guides-wknd-events/ui.apps/src/main/content/jcr_root/apps/wknd-events/clientlibs/responsive-grid. This client library has a category of wknd-events.grid and includes a single file named grid.less which includes the necessary CSS for the Layout Mode and the responsive grid to work. Next we will make sure that this CSS is loaded with the React app