Cannot adjust width of custom action column in report

Cannot adjust width of custom action column in report

I have already managed to adjust the width of columns that aren't custom actions. But when I try to adjust the width of a custom action and then click "save changes" it goes back to how it was. I also tried adjusting the width via report definition but this also does not work.

This is what I want

This is what I keep getting even after I click "save changes"