Combine Maps in Overlays

How can we combine individual map purchases to be seamless on the screen?

Let’s say we have separate map publishers or a map bundle with adjoining maps we’d like to connect like the National Geographic’s North Fork: Glacier National Park and Backroad Mapbooks Kootenay Rockies & Southern Alberta. All 3 overlap with each other and I’d like to be able to scroll from one into the next without having to go open a menu and select a different map.
I’m starting at a national level looking at the Natural Atlas base map (though any will work) and nothing specified for Canada.
I’ll tap on the top right folded map icon and select the Overlays tab.
  
I’m going to drag this card up a bit so I can see what I’m doing and then select the Map Overlays.
   
Here I’ll scroll down to the maps I’d like to connect over the same base map and toggle them on.
   
I’ll make sure the map settings are on “Normal” so they are stacked above the base map to be visible.
Now, I’ll close these cards and scroll in on the maps we just connected through the overlays. As you can see the National Geographic map scrolls seamlessly into the Backroad Mapbooks map.