‘Zillow’ but for all properties, including off market…

I don’t understand and I’ve always wondered why there isn’t the equivalent of ‘Zillow’ but for all property. Or even a way to search within Zillow for anything… not necessarily just properties for sale.

For example, within Zillow you can go to a home for sale and then click on the map, click lot lines, and then peruse through the map and click on homes - but there is no way to go back. If you click on a home and then want to see the next one, you have to go back to the original house for sale, navigate back to the map, and start over again.

It makes no sense why they don’t have this functionality built into the app or website. Thoughts? Anybody work for Zillow on here? lol