Thank you for your post! Unfortunately, you cannot view 2 maps at the same time. You can put your maps into a collection, which will allow you to swipe between the 2 maps instead of having to go back to the menu and select the other map.
There are steps on how to make a collection on iOS here:http://help.avenzamaps.com/customer/portal/articles/2460955
And on Android here:http://help.avenzamaps.com/customer/portal/articles/2515058
Let me know if you have any further questions!
Avenza Systems Inc