To close Google Maps on your Iphone here's what you do.
In the search bar at the top tap the three lines on the left side. This should open up the sidebar.
Next Tap “Settings”.
then Tap “Location History”.
then Tap “Location Reporting”.
To turn Location Reporting on, tap “Report from this device”. To turn it off, tap “Do not report”.
Hope that helps you turn off google maps on your Iphone.