Google Maps isn't an app, its a web site. Edge works fine for 2 finger zooming on my system with other web sites, except for Google sites.
Google will try to determine what browser you are using, and they will change how the site behaves depending on your browser. If they see you are on a desktop version of Edge or IE, they will allow zooming to be controlled by mouse. Touch won't work at all.
Strangely enough, two-finger zooming works just fine if you use Chrome on Google Maps from Windows 10. Looks like they want you to use their browser.
Using Bing Maps in the Edge browser will allow you to use the two-finger zoom, and it is blazing fast. Much faster than Chrome on Google Maps. Google Maps was even choppy in Chrome, but in Edge, Bing Maps is smooth as butter and blazing fast.
Another option you may want to try is the built-in maps app in Windows 10. You can download the maps you need on your local storage and not have to use your data bandwidth when checking the map or getting directions. Works great, and is much more touch friendly than Google maps ever was, as it was designed for touch.
08-07-2015 06:38 PM