Here’s an image. My header is a Reusable Element. When I go onto my About Page and left click the Header, I get this menu. Then, I click the “center” button.
I had the exact same issue. The panel mentioned by @andrewgassen were not visible to me either. A Bubbler helped me figure this out. When creating a reusable element, make sure you do the following:
The main group should not have a max width enabled. Group everything else inside in a group (second major group on the whole item) and make it fixed width. Then Andrew’s menu will be available in responsive tab, and everything should float centre. Bubble Rules!!
On the page itself, for the header, uncheck ‘make this element fixed-width’
On the reusable element for the header, group all the elements such as the hamburger icon, title, search icon etc into a group that has ‘apply a max width’ enabled
this should make the floating header (which is pulled out of the responsive engine), stretch across the page with the elements within retain their original centered position.
Ah, yes, this is how I have mine setup. I didn’t think about this. I never build fixed width interfaces, so this wouldn’t have stood out to me as obvious.
I do have all my headers set to have a group inside them that the elements live in, and that group has a max and min width, but the header itself is fluid.