There are five preferences for Resist:
The number of significant digits displayed outside user-entered areas can be set.
RMS threshold on inversion is the value below which the inversion (Invert from Data) will stop. Make this smaller to have the inversion try to fit the data more exactly.
Maximum Iterations is the number of times the inversion will try and find a better solution before giving up. Increase this to allow the inversion more chances to refine the model.
Show EM31 values will cause the EM31 conductivity for a unit 1 m off the ground to be displayed in the Model Window. The Coil Separation allows for similar devices to be used in place of the EM31's default 3.67 m coil separation.