When you use the normalization option, Sim4Life:
Computes the current flux through an automatically generated iso-potential surface
Scales all output quantities so that the resulting current matches the value specified in the Normalize Frequency-Domain Results field
The current value you enter represents the phasor amplitude, i.e. the baseline-to-peak current.
For more information, please refer to the Sim4Life Manual Section 2.13.7.3.3 Normalization -- Normalization to Current.