Changing the census display (in the shared note) would work. If you remove the columns that don’t have any information in them the width will be less.
Changing to 58% did not solve the display.
Did you clear your browser’s cache before checking?
The real cause of such problems is the extremely complex tables-based html used on the that page (and many others). It is one of the main areas I’m working on to simplify in kiwitrees-nova. It’s unfortunately just far too much work to fix it successfully in the current version.