Making list view full screen width?

[mudokai]

How could we expand the list records view to be the entire screen width? I'm trying simple CSS solutions and there doesn't seem to be a way to do so..this seems hard to believe, because all other CRMs do so and understand there is likely a situation we need to show either smaller font / fit more columns than 100% view usually allows. Would love to understand how to show more on this screen for our CRM. Thanks