I've found a couple I think improve the existing chart:
Include a color border on the right to make the distinction between groups easier
Make the border narrower as the category's depth decreases
Use the color when hovering categories to enforce the connection
Bold the totals and place them in the corner of each category's cell
Here's a mockup jsfiddle
I'm not a fan of using lorem at all (except in apps for designers). Users can be confused and distracted by this dummy text and it might not accurately model the context that the user is making these text adjustments too. It's best to use an actual example, though not necessarily "live" text, so users can get an accurate preview of how their settings would ...