Check Map

While trying to find a way to get a full image copy of my maps in the Cartographer Map Editor I found something called 'check map' under scenario but when I clicked it nothing happened. Any clues out there on what it might be? And I never could get that full image to copy. I tried to hodgepodge it using screen snap shop but that gave me unsatisfactory results.

Imo Check Map was meant to check if everything in your map is ok, like if there is no errors in it, but it doesn't seem to work.