I have a Foundry Header stack on my site (nested inside a Margin inside a Container), and see that the live preview shows a thin separation line (border), while the published site does not. The checkbox to enable it, at the bottom of the Page settings for the stack, is checked.
Also, the secondary text ends up on the same line as the header itself, is there anyway to make this appear below the header text?
Also, sorry I missed this in my first post – this is not a feature of the stack. The stack bases its usage of the sub headers off of how Bootstrap handles them.