Hello,

The mobile menu has the unified set of elements which are not changeable. They are search, menu, categories menu (activated in Header Builder http://prntscr.com/ius26g), whish-list (you are using other plugins not supported that I why it is not displayed), my account, widget area (it is empty).

As for the sticky header for desktop, please find here the detailed instruction how to configure: https://xtemos.com/docs/woodmart/header-builder/enable-sticky-header-option/
If you have any further question please feel free to contact us.

Best Regards