How do I see the full content of a dimension in a Google Analytics custom report?

I’m using this custom report from the gallery called “Exceptions Report (by Ron Whitman”. Here’s a screenshot of how it looks when I try to edit it:

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The problem is, that exception description column is the most important part of this report, but it gets cut off after a few characters and ends in “…”. Sometimes the string is very long, and I’d like to be able to make it multiline, too. How can I see the full Exception Description on my custom report?