The search verticals Web Part allow users to search through predefined scopes (i.e videos, people, etc.). The behavior is different from the search navigation Web Part because here, we simply replace the query template and result source dynamically for a chosen vertical. To get it work, you simply need to connect the search verticals Web Part to a search results Web Part using the associated option. Also, if you want to display counts for each verticals when a new query is performed (for instance a search box query or an URL fragment update), connect the search results Web Part to the search verticals one (two ways connection in this case).
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|Search verticals||Configure the search verticals to display. When you set a query template or a result source id for a vertical, these override the ones in the connected search results. You can also set an icon for a vertical using Office UI Fabric icons names. The query keywords are shared across all verticals. For instance, if you need default results for tabs, just specify a default query in the connected search results Web Part (like
|Show results count||Indicates if the results count should be displayed for each vertical. In this case, you need to connect the Web Part to an existing search results Web Part on the page.|