Hi,
I can’t find a way to do it in the editor, but a rather easy workaround is to edit the XML. Make your settings for a single column and then open the “XML Source” tab. Here, search for a <list-property name="highlightRules"> element inside a <column> element and change the other column elements to also contain the same highlightRules. Then make sure that the column names match by editing the <expression> element accordingly.
Kind regards,
Alexander