Auto Scale
There's an Auto Scale checkbox next to Carbonite's close button.
Hover over Carbonite's map and you should see an 'X' button with a checked, or empty, box to it's left in the top-right corner. So it's not an option found in the settings but an option on the map itself.
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"I have not failed, I simply found 10,000 ways that did not work." - Thomas Edison
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