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I am working with the Forms layout designer (not classic version). I have a table for which I need custom column widths. I have used CSS to achieve this. When I add the code to the column, I see the width change to what I'd expect in the layout, however, after I save the change and preview or run the process, the column width defaults back to no formatting. See screenshots below for the width I see in layout mode vs preview mode. Note the wider width for Date and smaller width for Miles in image #1 vs image #2.
LAYOUT MODE
PREVIEW MODE