I've read https://www.ag-grid.com/react-data-grid/grid-size/#top but still haven't figured out:
How can I make the table's width behave like auto so that it doesn't unnecessarily expand to the full width, taking up the entire window even when its contents don't require it?
See code at https://plnkr.co/edit/utQf6RGASwFVfGhW?preview
Also, a second attempt uses flexbox but still does not achieve what I'm hoping for: https://plnkr.co/edit/INyJbF4ZcydT0gUz