Using the "full width banner" view mode from an image entity doesn't generate an image to the frontend.
Use the view mode from an image entity, or alternatively visit /admin/structure/media/manage/image/display/full_width_banner and notice the widget cog isn't available and no settings exist. Change the formatter to something else, then back again and the settings become available to select one of two responsive styles.
Investigate if we're missing responsive styles that can't be set at theme install time.
Closed: outdated
9.3
User interface
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It's likely this issue predates Contrib.social: some issue and comment data are missing.