You can choose any font and type size to display times in the Clocks palette.
On macOS 13 or later, choose World Clock Deluxe > Settings. On macOS 12 or earlier, choose World Clock Deluxe > Preferences. Then click Palette.
Choose a font from the Font pop-up menu. If you want to use the system font, choose "System font".
Specify a type size using the Size combo box. You can choose a size from the list or specify a custom size.
Control-click the palette's background and choose a font and a type size from Font and Font Size submenus of the shortcut menu.
If you want to use the system font, choose "System font".