column width on mobile layout

Hi peterpan1966 

What is your expected result in the Mobile layout? To keep the column width the same as it is in Desktop layout or to optimize it for Mobile layout only?

I did a test with the Feb 2022 Power BI Desktop (Version: 2.102.683.0 64-bit). I lengthened the width of Category column in below table and switched off the Auto-size width. When I went to Mobile layout and dragged the table into canvas, its width was the same as I changed in Desktop view. 

If you want to set some formattings for Mobile layout specifully, you should go to Mobile layout first, then format the visual in the new format pane. You will see the following message when making the first change. https://powerbi.microsoft.com/en-us/blog/create-stunning-mobile-optimized-power-bi-reports-with-mobile-layouts-new-visual-formatting-pane-preview/ 

Hope it helps.

Best Regards,
Community Support Team _ Jing
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My issue is that I can't adjust column widths on Mobile view, only in the standard view.  For example, I might want column widths narrow in Mobile, but full width in Desktop to allow the user to see the whole lot.   Due to the mobile portrait mode, smallest text size being 8, this renders matrix boxes quite useless in mobile mode.