Responsive (new) reusable element on page not using new responsive engine?

Hi Bubblers. Working on a header reusable element with the new responsive engine. I’ve got the hang of it and in the editor’s Responsive tab, shrinking it with the slider works fine. But in the live (version-test) app it isn’t response. Is this because the page the header is on isn’t upgraded to the new responsive engine?
Fred (