Header Advertisement Area
Header Advertisement Area is a widget for Ads placement in the top header part.
Dashboard>Appereance>Customizer>Widgets>Header Advertisement area.
Step 1: First Click on Widgets
Step 2: Click on Header Advertisment Area
Step 3: Fill Widget Title if necessary and put CSS code for Advertisement. This place is best for Ads but not for other widgets even though you have add Widget options.
Step 4: Click on add Widgets to replace the Header advertisement area but Header Advertisement area is for header advertisement but not for other widgets.