Bentley Map automatically creates geometric properties for recognized features. These properties are read-only and include Geometry_Length for linear features, and Geometry_Perimeter and Geometry_Area for polygonal features.
The display of XFM calculated geometric properties can be disabled by defining the variable:
MS_GEOXFM_DISABLE_GEOMETRIC_PROPERTIES=1
The display of spatial database geometric properties can be disabled by defining the variable
MS_GEOXFM_DISABLE_DATABASE_GEOMETRIC_PROPERTIES=1
These variables can be added to your the Macros node of the Workspace in your project schema.