What functionality is missing? What is unsatisfying with the current situation?

  I would like to be able to turn off all of the marker groups with one click to just be able to view the map.    

How does this feature request address the current situation?

  I picture an option under the layers icon where you normally turn off select groups so you can just turn them all off.    

What are other uses for this feature request?

  It's mostly just to be able to look at the art of the map or get an idea of what the area looks like without the pins in a simpler manor than turning them all off one at a time. Just to save clicks and streamline someones experience.