https://imgur.com/a/S24xx
The relevant section of structure.tex is as follows:
% PAGE MARGINS \usepackage[ top=3cm, bottom=3cm, left=3cm, right=3cm, headsep=10pt, paper=letterpaper, layout=letterpaper, ]{geometry}
How do I fix this, so that the part number and part title are on the same line, as they should be?