This waveform editor is used for both AddSynth and PadSynth.
At the top there are a pair of graphic views. On the left is the complete oscillator with all filters and harmonic effects applied, and on the right the basic wave it is derived from.
The narrow image is the harmonic distribution. Each vertical bar represents one actual harmonic. This is most obvious with a sinewave base.
The larger image below is a more familiar waveform as would be displayed on an oscilloscope.
Note: PadSynth doesn't have the Phase or Harmonic Randomness controls. Instead it has the Apply button.