In general, you can use the Style Preferences Menu to change the font in which your song displays.
Tap on the sliders icon in the Menubar to open the Style Preferences Menu and choose the Document tab. Here you can change the font of the document to one of four different styles. Then, you can tap on the three dots icon in the upper right corner to open the Apply Style Menu. Here you can apply this style/font to other songs in your library, and/or to Future Songs to set it as a default font for newly imported content.