Timeslips 2020 Bill Pagination

I just upgraded from TS 2019 to 2020. Everything seemed to transfer over correctly including my billing layouts however, when I go to run bills, the bills don't look right. The page dimensions are still set to "Letter" but the design layout runs from left to right, 15" wide instead of the standard 8.5" in other words, it looks like my invoice runs over 2 side by side pages. I've tried creating new layouts, adjusting existing ones, nothing seems to change the fact that the pagination is too wide. When I go to print an invoice, it squeezes (very very small) onto a standard letter page. I can't seem to make any modifications. How can I get my layout back to normal?