You must configure your catalog for searching in order for the search icon to appear. The restaurant catalog is the home interface for your user and therefore is the primary entry point of your search.
We define a web location for Catalog Explorer to start fetching files from there. And that is where we uploaded our primary menus for Catalog Explorer to continue searching or fetches content to display in the search list.
This web location should only contains catalog files and images files for categories (has similar name as in category name).
Catalog Explorer will only fetch files from the specific web location. If the catalog is configured for location, it will extract the icon and display in the search header. If it is configured for content (categories), it will list them under the search list.