This option is customizing styles for your header. This will override the Dark and light setting from your header
Selecting yes, will drop down color options for your, Top Header Background, Top Header , Top Header Link, Top Header Link Hover, Header Background, Header, Header Link, Header Link Hover, Menu Background, Menu Link, Menu Link Hover, Sub Menu Background, Sub Menu Border, Sub Menu Link, Sub Menu Link Hover, Mega Menu Title, Sticky Background, Sticky Link, Sticky Link Hover, Humbarger background, Hambarger Link, Hambarger Link Hover and Hambarger Close Icon.
You can also custom the Main Header Height in this settings