To set the tolerance display on and off, use the Detail option tol_display. You can use the default_tolerance_mode and default_tolerance_display_style Detail options to control the display of the dimension tolerance values. When you set the value of the default_tolerance_display_style Detail option to std_iso, the ISO Tolerance Display Style option on the Display panel of the Dimension ribbon tab will appear selected.

Using the configuration file option maintain_limit_tol_nominal, you can maintain the nominal value of a dimension regardless of the changes that you make to the tolerance values. If you set it to yes, the system does not modify the Nominal Value of a dimension with a Limits tolerance format when you set the format to Limits or change the value of the upper or lower tolerance.