You can use ShortPoint to add full width section to a Modern or Classic SharePoint pages using these easy steps.

Modern Page

Classic Page

1. Edit any Section (or Background element) that you would like it to take the full width of your screen

2. Choose the Force full screen width option

You are done :)

Note: the support for full-width column is not available only in release ShortPoint SPFx (v6.1.0.0), all versions higher than should have the support for full-width columns ready in SPFx.