According to Google, your website URL structure is displayed in a breadcrumbs-like format on mobile search result.

This is to help mobile searchers to understand your website better. Having a well URL structure is important. If you are using WordPress and your site is new, you should update your permalink to use the following link structure

/%category%/%postname%/

To update your permalink, you can login and update at “Settings -> Permalinks” as follow and click “Save Changes“

WordPress Custom Structure