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What is FFT in SoMove scope?

FFT (fast fourier transformation), see is something that exists on real oscilloscopes. 
It gives the spectrum of recorded signal expressed in "harmonic orders".
It make sense to use it for harmonic analysis of recorded signal. Fast scope (device recorder), it is recommended to get more precise results due to more samples being recorded.

When it comes to FFT setting, starting point can be from zero (DC component will be included) or from 1 (without DC component) or any order of sub-harmonic you wan to investigate.
Number of points is like number of harmonic orders (max harmonics order to be investigated up to). Linear/logarithmic concerns the axis. 
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