To set the custom header style, navigate to your website admin, browse to Appearance > Customize > Header > General, from the header style dropdown, select Hidden/Custom.
Additional Header Settings for the Custom Header Style
The only main setting you get is for setting the Custom Header Layout.
Custom Header Layout
You need to first click over the checkbox next to “Enable Custom Header Layout”. Clicking it would enable the Select Layout label option. You will be able to see a drop-down; where you can choose your custom layout you have made for the header.
Add Header Container
Additionally, you can apply a header container to your page structure. Basically, the header containers center your template to align with the rest of the theme symmetrically.
You can click over the checkbox next to “Add Header Container” in General tab to apply the header container.