Length and Area units of measurement - planimeter
This screen has two parts, length units:
And area units:
For some units, like feet and square feet, meter and square meter - you can pick when their display will switch to “bigger” units mile or square mile, kilometer or square kilometer. This way you can have small lengths and areas expressed with small units and bigger ones to be shown in bigger units. By default this option is set as OFF for all these units.