I have some files that this works as designed and others where it does not. The files seem to have the same units, but one file shows Acres as a possible unit while the other only shows square feet. What is up with that?
In completion to the comments of Bob and Lorys, there is a wiki article on this subject/problem:Area measurement tools setting in Acre unit optionAdditionally, Tim Hickman as written a Blog on this subject some (a long) time ago:Survey Feet vs. International Feet
René R. van den BrinkTechnical SupportBentley Systems Incorporated