That's fine, I think I understand what you want, and have a possible solution for you.
If you go back to that report page and change the date range, it will adjust the graph now. That donut graph will now only show referral sources for the contacts that were entered within the date range selected in the top right.
I believe this will help better see the graph when it prints, because there will be fewer referral sources to look at in the first place. However, if you still need more data when you print, you can add a post to our
Suggestions & Feature Requests forum so our development team can look into adding it in a future version!
Please let me know if you have any more questions!