"Appearance" contains various controls for the "decoration" of the spectrogram - axes fonts, units, tick marks etc. These should hopefully be self-explanatory. They are aimed to make spectrograms in Luscinia acceptable for publication - the spectrogram image itself is saved using the Save Image button under the “Controls” tab. If the requirements of a particular journal can not be met with these options, I would appreciate being told!
The spectrograph should update itself automatically after the change of these parameters.