How to resize width of values columns in pivot widget

An existing widget configured as a pivot with rows and values (no columns in config), is not allowing me to resize the width of the columns within the pivot table in the dashboard view. 

The resize arrows are available - I drag to make the width smaller - the table column name in the header row shortens (also an issue), while the actual width of the table column remains the same.

Further, the name in the table column heading does not reposition or re-format to wrap text based on the size I set for the column. For example, a heading containing "Actual Revenue to date" appears as "Act..." when I attempt to shrink the width of the column even though the visual width of the column does not change. 
There is no point when I'm dragging to resize that the heading text wraps. I can either fully display or show as cutoff, meanwhile there is no change in the actual width of the column within the pivot. 

This is happening in only one of my widgets. If I add more values to the pivot, their columns in the table act the same. If I duplicate the widget, the table columns act the same. 

Is there a setting perhaps in Advanced Config or the widget editor? How do I fix this so I can actually resize the columns to reduce their width while also keeping the full value heading name displayed?