I made a new Experience with a Print Widget in a Widget Controller. I am using the Floating panel arrangement option and it looks awful.
I need to resize it, so I go to the Style pane, but "This widget does not support style settings."
I have gone deep into the weeds on this one trying and failing to hack a solution out of Developer Edition, but the real solution is super simple.
In the builder mode, grab the little white corner in the lower-right of the widget. Drag your mouse til it is the size you want and hit save.