Thank you guys! So it was "Doh!" I expected it to be an app, under 'apps'. And then after having thought I was crazy I found it under 'General' lower down at the page. Thanks!
Under the mentioned sandbox setting I can add better geolocation via Google. At the price of more surveillance, right? How bad is it? I assume being most of the time logged out of the google account I created in graphemeos amounts to no improvement at all? (But would love to know).