I’d love to see a switch for using full-page width.
I think you’d find a lot of users are used to working with large Excel worksheets or Dynamics/SAP/Infor would find this a more familiar option for self-serving the grid-data they do/don’t want to see.
I like the fixed-width document and list presentation too. I would just like this as an option where appropriate.
Attached are screenshots from my 27" 2560x1440px monitor.