Nathan,
There are changes coming to Report Builder including the ability to specify infinite width in the browser so the output will be similar to the old Report Builder.
I have tested the changes in Safari and they render properly. I did see the issue with the current Report Builder so hopefully this is fixed.
I do recommend using either Firefox or Chrome for Scoutbook so you can take advantage of the volunteer written and supported Feature Assistant Extension for Scoutbook for Chrome and Firefox. The extension adds many useful features to Scoutbook that makes it much easier to use. See Feature Assistant - What is it? for details.
