How can I Make jQM layouts more flexible and reflow page content?

How can I Make jQM layouts more flexible and reflow page content?

Okay, I am new to this forum and using jQuery Mobile. I have a number of queries but right now I am looking for help with two issues.

How To Make jQM layouts more flexible.

I refer to making jQM apps more responsive. The issues I notice are on large screens, list views okay on phones but not scaling to bigger screen widths.

On that, another query. How to reflow page content? I mean use multiple columns on large screens. Hope I make sense. So they stack one below the other on smaller screens.

Any help appreciated like example code or online tools, thanks.