Change column width in the mobile view

Here's what I've been able to find looking for a solution myself:
-What you're trying to achieve (table/matrix visual having different set sizes for columns in Desktop and Mobile) is not currently possible.
-Table/Matrix visuals are not optimized for mobile view and usage.

In order to make consumption of your content on mobile easier, consider using other visuals and simply hide them in Desktop view. This is the current workaround I use in order to have a clean and functional interface in both Desktop and Mobile.

Hi wcarter 

The ability to adjust column header for mobile should be available in the next Desktop release.
Thanks,

Michal