Add Full Width Web Part to Modern Team Sites
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.
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.