Choose Menu in Header Builder
on the following site i'd like to set a specific menu in the right corner of mobile- and tablet-action-bar.
I set up the menu and in header-builder i'd like to choose the menu. But as you can see in the screenshot, there's no menu to choose in the pull-down-menu. (On other websites, setup with betheme, in the headerbuilder i can choose, which specific menu i want to place.)
How ca i fix this?
Thanks for your help in advance.