To change the absolute size of the music printed or the relative sizes of the chord symbols or lyrics, click the <i>Display</i> icon at the top right of the window:
<ul>
<li><i>Staff Size</i> (default 20) determines the overall size of the music.</li>
<li><i>Chord Size</i> (default 6) determines the font size for chord symbols.</li>
<li><i>Lyrics Size</i> (default 0) determines the font size for the lyrics.</li>
</ul>
All of these sizes can be specified as floating point numbers if desired.