This is still an experimental component, which overrides widgets, will most likely break with header refactors, and will not play well with other header components.
We’ll do our best to maintain this component and to minimise breaking changes, but we can’t guarantee these will never occur. A fix will most likely come, but you may have to wait a bit longer.
it’s officially supported in that we’ll look at bugs that are reported, but it’s still experimental in the sense that it’s not something we expect to work well with all themes and theme components
Given the announcement over here, I wanted to point out some discrepancies in experience when using the Full Width component and the header search feature.
I assume at least the same experience should be the case, if not simply collapsing the header search to an icon for very low page widths (like on the mobile view).
We just recently merged a fix to ensure the header search bar collapses to the icon on small screen widths. Once you’ve updated Discourse, could you please take a look and let us know if that’s looking better?