If you click on your Hero Banner Image, in the editor, you will see the "Alignment and spacing" panel appear on the left. You can set your banner to be full width.
Not all modules have the "Alignment and spacing" panel.
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Mike
Here to learn more about HubSpot and share my HubSpot Knowledge. I'm the founder of Webalite a HubSpot Partner Agency based in Wellington, New Zealand and the founder of Portal-iQ the world's first automated HubSpot Portal Audit that helps you work smarter with HubSpot.