It is not currently possible to click on a location at the end of a round in party games to review it in google maps. You have to wait for the end of the game to review all the locations.
When I stream geoguessr parties, if I want to open a location at the end of a round, I have to max zoom on the location, click on the google icon at the bottom left of the map, click on the street view icon, place it on the map and hope that I did not miss the right spot. This is hard work, time consuming and make party games not practical if you want to talk with the players about a location.
This feature is available in classic mode. Please, make it available also in party games.