Add Full Width Web Part to Modern Team Sites
this is half the story (https://docs.microsoft.com/en-us/sharepoint/dev/spfx/web-parts/basics/use-web-parts-full-width-column)
But there are plenty of business reasons why you need to create an spFX web part that would use the full width of the screen.
I don't know why microsoft needs to dictate that you have 1244 px to show you content on a team site, and not 1 pixel more.

1 comment
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Dan commented
We could benefit from having this full-width zone available on modern team sites in SPO. People keep requesting it here, and I tell them they have to get a hub site for that (or a communication site), when all they want is to create or edit a site page, add a full-width web part, and done.