Allow user to prevent automatically pulling up better map when at the edge of a map of interest

[garrettdashnelson]

[Submitted by Carl Zimba via ask@bpl]

Sometimes when I use Atlascope more, I am exploring the edges of the older maps. An aspect of Atlascope is that if you wander too far off the edge of the map, the software will automatically load a new map that covers the region a bit better. Unfortunately, I was interested in the edge of the map that I was looking at and not the newly displayed map, largely because I was looking at changes and features in the date sequence of maps. Is there a way to lock the overlay map so it does not change as the zoom and pan are adjusted?