In Dynamik is it possible to add the primary navigation to the fixed header? (without resorting to a plugin)
Add navigation/menu to fixed header?
Two ways that I know of... Use the "Navigation Menu" widget to add the menu to the "Header Right" widget area.
Or, under "Dynamik->Custom" use the "Hook Boxes" to insert the menu any where there is a hook on your page.
Found this tutorial from @eric : https://cobaltapps.com/implement-fixed-header-dynamik-website-builder-designs/