How to set different header in the Mobile version?

To set a different website header, click on the mobile studio. Then, hover over the header item and click on the pencil icon. The menu will open and from there you can do the changes.

The header is the top section of the website that is present in the main content. You may wish to have a header which is different from the one present on your full-scale website in order to give the mobile visitors unique user experience.