Navigation:  Preferences > Skins page > How to (skins) > How to: change default caption font of skinless note

Right click on program icon appears in system notification area and choose "Preferences" menu item from pop-up menu or click on button on PNotes Control Panel.

When "Preferences" dialog appears, choose "Skins" page.

 

To change default caption font of skinless notes click on "Caption font" button and choose desired font in font choosing dialog: