The H1 is the main heading Google (and visitors) use to understand what a page is fundamentally about — a missing H1, or multiple competing H1s on one page, dilutes that signal and makes it harder for both users and search engines to immediately grasp the page's topic.
Your H1 is the clearest single signal you give Google about what a page is actually about. Pages with no H1, or with multiple competing H1s, dilute that signal.
Every important page has exactly one clear, topic-relevant H1.
Fix it, then re-scan — the check confirms itself. No manual checkbox, the scan is the truth.
Run this check in H.I.V.E. →