How to style the Main & Sub Heading?

Add the Main & Sub headings in the Content > Basic tab, but for styling those heading go to the Style tab.

Go to Style > Sub Heading tab where you have the options of styling the sub heading. Here you can add text color, typography spacing between the sub & main heading and other decoration options.

Sub Heading Options

Go to Style > Heading for styling the main heading of the widget by adding text color, shadow and the typography.

Main Heading Options