Hi @Anonymous
You can use ShortPoint feature called Force Full-width Screen to have ShortPoint covering full width of your classic or modern page.
In edit mode of your Modern Page under communication site, add Full-width column section:
More information:
https://support.shortpoint.com/support/solutions/articles/1000272470-full-width-section-and-page-in-shortpoint
In addition, you can also do this by sharepoint designer:
https://www.stadlersoftware.com/no-code/removing-the-header-on-sharepoint-online-modern-pages/
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