Pihole use to have only one blockingmode. In previous versions (v1.x and v2.x), pihole responded to a blocked site with a web page, indicating the requested website was blocked. All of these blocked replies used to be logged in /var/log/lighttpd/access.log, as they are served by lighttpd, pihole's webserver.
The default blocking mode is now null blocking, witch doesn't inform the user of blocking anymore. This change was made because most of the add servers started using https, pihole can only serve the blocking information if http is used.
In short, if you're using the default blocking mode, it's normal that you only see the local requests, i.e. the requests made by the pihole admin interface.
You can still use openssh to look at other logs on your system, explained here.