Documentation:
Simple Heading

Here you can control the styling of the rule.

Rule Alignment

Here you can control the rule vertical alignment between the heading and subheading.

Rule Start

Here you can control the rule start position. Negative values will position the rule outside the element’s bounds. Positive values will position the rule inside the element’s bounds.

Rule End

Here you can control the rule end position. Negative values will position the rule outside the element’s bounds. Positive values will position the rule inside the element’s bounds.

See here for an example.

Other settings here are common to most Divi modules and are not discussed further. For more information on common Divi module settings, please consult the Elegant Themes Documentation.