How to stretch details view?

Is it possible to make my details view larger? I’m trying to use the hack to view a set of tables in multiple columns, but I can’t resize the frame so its all smushed.

You can set the size of the page/canvas to wide in the Page settings maybe

Tried this. It does expand a little bit if set to wide, but not by much. It’s like its set to the default size of a website body.