SharePoint Online Modern Search and Filter Question

Have a question. I saw in a demo a consultant put on for us they were able to add a search bar to the home page of a site. That when you search on the right-hand side the filter pane comes up like when you're trying to adjust what you want to filter on in a list or a library. I really liked this feature but not for there cost :). I would like to do it on my own but don't seem to see where to get started. Anyone have any ideas. Were using Modern Sharepoint Site with a document library that uses content types. There all filterable / searchable in the document library just not on the main home page.