Design 2.0 introduces full-functioning header blocks: an entire header with all the pieces in a single block. If you are using a theme that does not have a new header or would like to upgrade your existing theme by adding a new header, you can follow the steps below.
The video below shows you how to convert the header of an older theme to a new header.
This could be trickier than it sounds, but fortunately, when you right-click anywhere in the header you will have the "Layers" option inside of our context menu. This is important because some themes have full-width Boxes that completely cover the header making it difficult to click on. So, inside the Layers menu, you will be able to select the header.
Once your header is selected you will see an option either by right-clicking or locate the "Quick Action" buttons (see video) to select "Change Header". This will open the New Headers menu.
From the New Headers menu, you will be able to select a New Header. Click on it and your header will be converted. The new Header will take default colors and font sizes from your Theme Fonts & Colors settings.
Once converted, click on the header again. Then using the right-click menu or quick action buttons to select "Edit" or "Design" to open the CMS or Design windows.