These are part of the "Proposal Level 2 Items" subreport. To modify this:
1) create a custom copy of this subreport. Note that there is one version that shows product images and one that does not. Pick the appropriate one.
2) change the fonts in the subreport and publish
3) modify your main proposal by linking your new subreport into the main report. You will find the subreport in the ItemFooter section (it's very small but fills the entire page width)
This video should help show you the necessary steps. Let me know if you need additional assistance.
http://www.screencast.com/users/Seno...3-731eec01a6f1