How to stop Location field from staying filled in when someone views a listing?

When someone views the archive (i.e. all search results) they can then click on any particular one to view that listing (the Detail page).

But when they go back to the archive page to look at a different listing, the “location” search field is now pre-populated with the location of the listing they just looked at, meaning the map no longer shows all listings.

How can I stop that happening, so that every time they return to the archive (main search map) page they can see all the listings again?

This video gives you a quick walkthrough, to make it clearer what my problem is!

https://drops.audience.ninja/geur9QEA