Your display is set in under
Options>Project Preferences>Dimensions
Select the area button (circled) and set the Decimals to '0'.
You can make a 'dimension profile' for the layer combination where zone areas are displayed in your zone stamp.
Making this 'dimension profile' is important because this setting showing no decimals will apply to all areas displayed while this 'dimension profile' is active.
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"